AI Summary Overview
What is Glaucoma?
Glaucoma is a group of chronic eye diseases that damage the optic nerve, the structure that is responsible for transmitting visual information from the eye to the brain. The damage most commonly occurs due to increased intraocular pressure (IOP), although glaucoma can also develop in individuals with normal eye pressure.
It normally has a slow course, and it begins by attacking peripheral (side) vision and then later central vision. Since glaucoma normally does not have symptoms or cause pain, it is commonly referred to as the ‘silent thief of sight’. Without timely diagnosis and treatment, glaucoma can result in permanent blindness.
Glaucoma usually affects older people, but it can happen to anyone irrespective of their age, even babies. Eye examination is necessary to detect glaucoma early, especially among people who fall under the high-risk category.
What are the Types of Glaucoma?
Glaucoma is classified into different types depending on the cause, drainage angle of the eye, and the pattern of optic nerve damage.
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Primary Open-Angle Glaucoma (POAG) The most common type of glaucoma is POAG. In this condition, the eye's drainage system becomes less efficient, causing fluid to build up and increase eye pressure. The disease develops slowly and usually does not cause symptoms until vision loss has already occurred.
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Angle-Closure Glaucoma When the drainage angle of the eye between the iris and the cornea becomes partially or completely blocked, it results in a quick rise in eye pressure. Acute angle-closure glaucoma is an ophthalmologic emergency since vision loss can occur rapidly if not treated on time.
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Normal-Tension Glaucoma Normal-Tension Glaucoma occurs even though the eye pressure remains within the normal range. Researchers believe reduced blood supply to the optic nerve or increased sensitivity to it may contribute to this condition.
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Congenital Glaucoma Congenital Glaucoma is one of the rare conditions that occurs right from birth or when the person is still young. The disease occurs because of an improper development of the eye's drainage system while the fetus was developing in the mother’s womb. Timely diagnosis and treatment are important to protect the vision.
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Secondary Glaucoma Secondary glaucoma is caused by an underlying condition. Some of the causes include eye injuries, prolonged use of corticosteroids, eye infection, diabetes, previous eye surgery, or any other eye condition that affects fluid drainage.
How Common is Glaucoma in India?
As per the research, it is estimated that approximately 11.2 million individuals aged 40 years and above are living with glaucoma in the country. Notably, primary open-angle glaucoma affects around 6.48 million persons, while primary angle-closure glaucoma affects an estimated 2.54 million persons.
Experts believe that almost 90% of the glaucoma patients in India go undiagnosed because of the silent nature of this disease. Longer life expectancy, diabetes, genetics, and lack of regular eye screening are the reasons for the increasing cases of glaucoma.
While anyone at any age may be affected by glaucoma, the risk gets higher after 40 years of age. The early diagnosis of this disease is possible through routine eye tests, and it can even help avoid vision loss.
Symptoms of Glaucoma
Glaucoma is a group of eye diseases that damage the optic nerve, causing vision loss. Most types begin without any early signs, and therefore, changes in vision might not be noticed until the disease is advanced.
| Gradual-Onset Symptoms | Sudden-Onset Symptoms |
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Related Diseases Comparison
Glaucoma has some things in common with other common eye problems, making it hard to tell apart without a full eye check. Knowing how glaucoma is different from cataracts and diabetic retinopathy helps explain why early detection is important.
Glaucoma vs Cataract vs Diabetic Retinopathy
| Basis of Comparison | Glaucoma | Cataract | Retinopathy |
| When it Happens? | Usually chronic and progressive; open-angle glaucoma develops slowly over time, while acute angle-closure glaucoma can occur suddenly. | Develops gradually as lens proteins break down and cloud the lens, typically with age. | Occurs as an eye complication of diabetes, caused by damage to small blood vessels in the retina. |
| Location | Optic nerve at the back of the eye, often linked with fluid drainage problems and raised eye pressure. | Lens of the eye, which sits behind the iris and pupil. | Retina, the light-sensitive tissue lining the back of the inner eye. |
| Associated Symptoms | Often no early symptoms; later loss of peripheral vision; acute angle closure may cause severe eye pain, nausea, redness, blurred vision, and halos. | Painless, gradual clouding and blurring of vision. | Vision may worsen as the condition progresses; symptoms can be absent in early stages, making regular eye exams important. |
| Severity | Can cause irreversible vision loss and blindness if not controlled. | Can significantly impair vision but is generally treatable with lens-removal surgery. | Can damage vision through retinal blood-vessel disease and is a leading cause of vision loss in people with diabetes. |
| Can it be Reversed? | Existing vision damage cannot be reversed; treatment aims to prevent further worsening. | Vision loss from cataract can be reversed with cataract surgery. | Progression risk can be reduced through diabetes control and eye care, but established retinal damage requires ongoing ophthalmic management. |
Medicines Used to Treat Glaucoma
Glaucoma cannot fix vision damage that has already happened, but treatments like medicines, laser therapy, or surgery can reduce eye pressure and help stop more damage to the optic nerve.
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Prostaglandin analogues, such as latanoprost, travoprost, and bimatoprost
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Beta-blockers, such as timolol
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Carbonic anhydrase inhibitors, including dorzolamide, brinzolamide, and acetazolamide
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Sympathomimetics or alpha-agonists, such as brimonidine
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Miotics, such as pilocarpine
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Antiglaucoma medicines, such as timolol plus brimonidine, dorzolamide plus timolol, and bimatoprost plus timolol
Living with Glaucoma in India: Daily Challenges, Follow-up, Financial Burden, and Caregiver Support
Living with glaucoma needs you to stick to your treatment and regular check-ups for a long time, but with steady care, the disease can be kept under control.
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Daily Challenges Visual field loss and reduced visual acuity can affect activities required for independent living and social functioning. In advanced disease, these changes can increase dependency on others and may require specialised rehabilitation support.
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Mobility and Safety Glaucoma-related visual field loss can affect your ability to navigate your surroundings safely, and happens particularly in advanced stages where your peripheral vision is predominantly affected.
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Monitoring and Follow-up Regular follow-up with your treating doctor is essential in managing your glaucoma. The Indian Council of Medical Research (ICMR) states that follow-up is mandatory for disease stabilisation, which is achievable with completing treatment and monitoring.
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Financial Considerations Long-term glaucoma care in India may create a financial burden on you and your family. This consists of medicine costs, repeated hospital visits, travel to specialist clinics, and time away from work. This burden increases with your disease severity, as advanced glaucoma may raise your dependency on caregivers, rehabilitation needs, and caregiver costs.
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Mental Well-being Fear of blindness, anxiety, and depression are recognised psychological effects of living with glaucoma in India. Your concerns about the ongoing cost of eye drops can add to this psychological load.
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Caregiver Support If you have severe glaucoma and need help with daily tasks, you may need a caregiver for support and clinic visits. Regular follow-ups, including pressure checks and eye tests, mean that planning for caregiver help is important.
Glaucoma Treatment Cost in India
Glaucoma treatment usually continues for life. Your costs may go up if you need laser procedures or surgery as the disease progresses.
| Treatment | Cost Range |
| Specialist Consultation | ₹350 to ₹700 per consultation |
| Intraocular Pressure (IOP) Measurement – Both Eyes | ₹136 to ₹200 per test |
| Optical Coherence Tomography (OCT) – Both Eyes | ₹1,428 to ₹1,890 per test |
| Antiglaucoma Eye Drops | ₹71.51 to ₹960.68 per pack or bottle |
| Argon Laser Trabeculoplasty – Per Eye | ₹3,400 to ₹5,000 per eye |
| YAG Laser Iridotomy – Per Eye | ₹3,400 to ₹5,000 per eye |
| Trabeculectomy – Per Eye | ₹13,600 to ₹20,000 per eye |
| Glaucoma Valve Surgery – Per Eye | ₹13,600 to ₹20,000 per eye |
Disclaimer: The figures below are sample item-level costs from Indian sources and may vary by city, provider, and individual treatment plan.
What Causes Glaucoma?
Glaucoma is a condition that develops due to damage to the optic nerve. The exact cause of this disease may vary, although there are different risk factors for glaucoma, including increased eye pressure and certain health conditions, that can contribute to its development.
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Causes of Primary Open-angle Glaucoma
The following are the major causes and contributing factors of Open-angle Glaucoma:
- Increased Intraocular Pressure (High Eye Pressure): Elevated pressure inside the eye is the most significant risk factor for Primary Open-Angle Glaucoma. Increased eye pressure can gradually damage the optic nerve, which can lead to permanent loss of vision if not treated on time.
- Ageing: The risk of Primary Open-Angle Glaucoma increases with age, particularly after 40 years. Age-related changes in the eye may affect fluid drainage and increase the likelihood of optic nerve damage.
- Family History of Glaucoma: Individuals with a parent or sibling who has glaucoma have a higher risk of developing this condition due to inherited genetic factors.
- Thin Corneas: People with thinner-than-average corneas have a higher chance of developing Primary Open-Angle Glaucoma and may also have an underestimation of intraocular pressure during eye examinations.
- Diabetes: Diabetes is generally linked with an increased risk of glaucoma. Long-term high blood sugar levels may affect the blood vessels and optic nerve, increasing susceptibility to damage.
- Long-Term Use of Corticosteroid Medications: Prolonged use of steroid eye drops, oral steroids, or inhaled corticosteroids may increase intraocular pressure and raise the risk of developing glaucoma in susceptible individuals.
- Severe Nearsightedness (High Myopia): Individuals with high myopia have a greater likelihood of developing Primary Open-Angle Glaucoma because structural changes in the eye may increase vulnerability to optic nerve damage.
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Causes of Angle-Closure Glaucoma
The following are the major causes and contributing factors of Angle-Closure Glaucoma:
- Narrow Drainage Angle: Individuals born with a naturally narrow drainage angle are at a higher risk of developing Angle-Closure Glaucoma because fluid cannot drain efficiently from the eye.
- Ageing: As individuals age, changes in the eye can make the drainage angle narrower, increasing the risk of Angle-Closure Glaucoma, particularly after the age of 50.
- Hyperopia (Farsightedness): Individuals with farsightedness often have smaller eyes and shallower anterior chambers, which increase the likelihood of angle closure.
- Pupil Dilation: The pupil may enlarge in dim lighting, during emotional stress, or after the use of certain medications. In susceptible individuals, this can trigger a sudden blockage of the drainage angle.
- Certain Medications: Some medications, including certain antidepressants, antihistamines, decongestants, and drugs used to dilate the pupils during eye examinations, may increase the risk of Angle-Closure Glaucoma.
- Family History of Glaucoma: Individuals with a close family member diagnosed with Angle-Closure Glaucoma have a higher risk of developing the disease due to inherited anatomical characteristics.
- Eye Conditions or Previous Eye Surgery: Certain eye disorders, trauma, or prior eye surgery may alter the eye's anatomy and increase the risk of Angle-Closure Glaucoma.
What are the Complications of Glaucoma?
If glaucoma is not diagnosed and treated on time, it can lead to several serious complications that permanently affect vision and quality of life.
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Permanent Vision Loss: Damage to the optic nerve can result in irreversible vision loss that cannot be restored.
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Peripheral Vision Loss: Peripheral vision loss is common in glaucoma patients, whereby people cannot see objects outside the central field of vision.
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Tunnel Vision: As glaucoma progresses, the visual field becomes increasingly narrow, leaving only central vision in advanced stages.
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Complete Blindness: Untreated glaucoma is one of the leading causes of irreversible blindness worldwide.
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Optic Nerve Damage: Ongoing damage to the optic nerve can continue even without noticeable symptoms if the condition is not properly managed.
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Difficulty Performing Daily Activities: Vision loss may interfere with reading, driving, walking, recognising faces, and other routine tasks.
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Increased Risk of Falls and Injuries: Reduced peripheral vision and impaired depth perception can increase the likelihood of falls, especially in older adults.
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Mental Health Issues: Progressive vision loss may contribute to depression, anxiety, social isolation, and reduced quality of life.
When Should I See My Healthcare Provider?
Individuals should seek medical attention if they experience any of the following symptoms:
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Gradual Loss of Side Vision: Difficulty noticing objects in peripheral vision may be an early sign of glaucoma.
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Blurred Vision: Persistent blurred vision that does not improve with glasses should be evaluated.
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Eye Pain: Eye pain that is moderate or severe, particularly accompanied by any sort of redness or changes in vision, must be addressed urgently.
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Halos Around Lights: Seeing rainbow-colored halos around lights may indicate increased eye pressure.
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Sudden Vision Loss: Any sudden loss of vision is a medical emergency and should not be ignored.
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Severe Headache with Eye Pain: A sudden headache accompanied by eye pain, blurred vision, nausea, or vomiting may indicate acute angle-closure glaucoma and requires emergency treatment.
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Redness of the Eye: Persistent redness along with pain or changes in vision should not be ignored.
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Family History of Glaucoma: Individuals with a family history of glaucoma should undergo regular comprehensive eye examinations even if no symptoms are present.
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High Eye Pressure: If routine eye examinations show elevated intraocular pressure, regular follow-up with an ophthalmologist is essential.
How is Glaucoma Diagnosed?
Doctors use several tests to diagnose glaucoma, evaluate optic nerve damage, and determine the severity of the disease.
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Comprehensive Eye Examination The doctor takes into consideration the medical and family history of the patient along with his/her present symptoms and risk factors. An eye examination enables the healthcare provider to detect any early signs of nerve damage before any vision loss occurs.
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Tonometry Tonometry is a diagnostic test used to measure the pressure inside the eye, known as intraocular pressure (IOP). This test can be carried out either using a small tool that comes in contact with the eye surface after applying numbing drops or using a machine that emits a puff of air onto the eye.
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Ophthalmoscopy (Optic Nerve Examination) The aim of this procedure is to look for any glaucoma signs in the optic nerve. The procedure is done using certain lenses and a bright light, where the doctor examines the size, shape, colour, and appearance of the optic nerve head. Changes in the size of the optic nerve head, increased cupping or nerve tissue thinning may indicate glaucoma.
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Visual Field Test (Perimetry) The visual field test or perimetry is a test that determines the entire extent of vision, including side vision. During the test, the patient keeps looking straight ahead and responds to lights in the visual field. This test is useful in diagnosing any areas of visual impairment, which might go unnoticed during routine activities.
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Optical Coherence Tomography (OCT) OCT is a type of imaging technique that uses light waves to obtain images of the retina and the optic nerve. It provides the thickness of the retinal nerve fibre layer and helps identify early structural damage before noticeable vision loss occurs.
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Gonioscopy Gonioscopy is a specialised eye examination used to evaluate the drainage angle located between the iris and the cornea. After numbing the eyes with eye drops, the ophthalmologist will put on a specialised contact lens for clear assessment of the drainage system and establish whether the angle of the drainage system is open, narrow, or closed.
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Pachymetry This is a quick and painless procedure that uses ultrasonic or optical technology to measure the thickness of the cornea. Since the cornea thickness may affect the intraocular pressure, this procedure is used by ophthalmologists to interpret eye pressure.
How is Glaucoma Managed?
The main objective for treating glaucoma is reducing intraocular pressure, stopping the damage caused to the optic nerve, and preserving vision. Primary Open Angle Glaucoma can be treated using various measures such as taking medicines, laser therapy, conducting eye tests, and surgical procedures. On the other hand, Angle-Closure Glaucoma needs immediate treatment involving medicines and laser therapy, among others.
Some common ways of managing glaucoma include:
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Prescription Eye Drops: Eye drops are the first-line treatment for most patients. They work by either reducing the aqueous humour production or improving its drainage, thereby lowering intraocular pressure.
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Oral Medications: If eye drops alone cannot control intraocular pressure, oral medicines such as carbonic anhydrase inhibitors can be used to reduce eye pressure further.
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Laser Trabeculoplasty: Laser trabeculoplasty is a minimally invasive procedure that makes use of laser energy to improve the drainage of aqueous humour through the eye's natural drainage system, helping lower intraocular pressure.
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Glaucoma Surgery: Surgical procedures, such as trabeculectomy or minimally invasive glaucoma surgery (MIGS), may be recommended when medications and laser treatment are insufficient to control the disease.
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Regular Eye Examinations: Routine follow-ups are necessary to check eye pressure, the condition of the optic nerve, changes in the visual field, and whether there is a need to change the medication regimen.
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Medication Adherence: Using prescribed glaucoma medications exactly as prescribed by the doctor is critical for sustaining normal eye pressure and preventing damage to the optic nerve.
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Healthy Lifestyle and Management of Medical Conditions: Maintaining a healthy lifestyle, controlling diabetes and high blood pressure, avoiding smoking, and engaging in regular physical activity may support overall eye health.
What is the Prognosis for Glaucoma?
The prognosis depends largely on how early glaucoma is diagnosed and how well treatment is followed. Most individuals diagnosed early and treated appropriately can preserve useful vision throughout their lifetime. However, glaucoma-related vision loss is permanent because damaged optic nerve fibres cannot regenerate.
Patients who attend regular follow-up appointments and use prescribed medications consistently usually have a much better long-term outcome than those with untreated disease.
Is Glaucoma Curable?
No, glaucoma cannot be cured, and vision that has already been lost cannot be restored. However, most forms of glaucoma can be successfully managed with medications, laser treatment, or surgery. Early diagnosis and lifelong monitoring help slow disease progression and reduce the risk of blindness.
How Can I Prevent Glaucoma?
Although glaucoma cannot always be prevented, the following measures may help reduce the risk of vision loss:
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Undergo comprehensive eye examinations every 1-2 years after the age of 40 or earlier.
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Follow prescribed glaucoma treatment without missing doses.
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Inform the doctor about any family history of glaucoma.
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Protect eyes from injuries by wearing protective eyewear.
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Manage diabetes, hypertension, and other chronic medical conditions.
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Exercise regularly as advised by the doctor.
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Avoid taking steroids unless prescribed.
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Maintain a healthy lifestyle and avoid smoking.
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Seek immediate medical help for sudden eye pain or vision changes.
Does Health Insurance Cover Glaucoma?
Yes, the majority of health insurance plans cover glaucoma treatment if it is medically necessary. This may include hospitalisation, glaucoma surgery, diagnostic tests, specialist consultations, and prescribed treatments. The exact coverage depends on the insurer, the type of policy, and its terms and conditions.
Most health insurance plans cover glaucoma after a waiting period, which usually ranges from 1 to 2 years, depending on the policy. Some plans may also have exclusions, sub-limits, or specific conditions for eye-related treatments. It is important to check the policy document to understand what is covered before making a claim.
How Much Health Insurance Coverage is Needed for Glaucoma Treatment?
Health insurance requirement varies based on the severity of glaucoma and the need for treatment and surgery. The majority of financial planners believe that an ideal health insurance cover should be at least ₹5 lakh to ₹10 lakh to provide comprehensive cover against future medical costs. However, people who require multiple surgeries, laser treatments, etc., can choose higher health insurance coverage.
FAQs
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Q1. What is glaucoma?
Ans: Glaucoma is a group of eye conditions that damage the optic nerve, usually because of increased pressure inside the eye. If left untreated, it can lead to permanent vision loss or blindness. -
Q2. What are the early symptoms of glaucoma?
Ans: Early glaucoma often has no noticeable symptoms. As it progresses, people may develop peripheral vision loss, blurred vision, severe eye pain, halos around lights, headache, nausea, or vomiting. -
Q3. Can glaucoma be cured permanently?
Ans: No, glaucoma cannot be cured permanently. However, early diagnosis and treatment can slow or stop disease progression and help preserve remaining vision.
