Glaucoma is considered to be the major cause of irreversible blindness in the world- but the majority of those affected by it do not show any signs until it is too late. Knowing the red flags, risk factors and treatment methods might save your vision.
What is Glaucoma?
Glaucoma is a category of eye conditions that destroys the optic nerve, a critical cable that conveys visual data of the eye to the brain. The most prevalent cause is higher intraocular pressure because of the accumulation of fluid when the eye's natural drainage system (trabecular meshwork) is impaired or obstructed.
It compresses the fine nerve fibres of the retina gradually as the pressure increases, resulting in the loss of retinal nerve fibres and the appearance of a cupping of the optic disc that can be seen when an eye exam is taken. The outcome is irreversible loss of visual field, which begins at the periphery and advances inwards, hence the central vision is maintained until late. Most patients do not realise it until it is too late.
Why is It Called the Silent Thief?
In primary open-angle glaucoma, the most common type, there is neither pain nor redness nor blurring of the vision in the initial stages. The accumulation of optic nerve damage is silent and has a cumulative effect over months and years. The loss of peripheral vision occurs very slowly, such that the brain will counter it, which will almost make the loss invisible. Until patients suspect that something is amiss, a considerable portion of nerve fibres, up to 40% of them, can be damaged permanently.
Causes of Glaucoma
Glaucoma occurs when the optic nerve becomes damaged, most often due to increased pressure in the eye. The key causes are as follows:
High Eye Pressure (IOP) - The most frequent cause. When the trabecular meshwork does not effectively remove aqueous humor, the pressure accumulates silently and ultimately hurts the optic nerve in the long run.
Poor Blood Flow to the Optic Nerve - Damage is carried out even with normal eye pressure, but with less blood flow to the optic nerve. That is what occurs in normal-tension glaucoma, which is commonly associated with low blood pressure and poor circulation.
Genetics and Family History - Glaucoma runs in families. Hereditary factors that influence the trabecular meshwork, the formation of the optic disc, and corneal thickness all pose significant risk factors.
Age-Related Changes - The capacity of the eye to drain becomes inefficient in old age. The risk rises steeply after 60, and the proportion of those over 75 is estimated to be 10%.
Underlying Medical Conditions- Diabetes, high blood pressure, hypothyroidism, and sleep apnea all influence ocular blood flow and increase the risk of glaucoma.
Eye Anatomy- Narrow drainage angles, thin corneas, and large optic disc cupping are structural risk factors that predispose some people.
Drugs Corticosteroid use - in any form - over a long period of time may increase intraocular pressure and cause secondary glaucoma.
Eye Injury or Surgery - injury or surgery may destroy the drainage system, resulting in subsequent glaucoma months or even years later.
Types of Glaucoma
Glaucoma is of many types, but they are predominantly of four different types, namely:
Primary Open-Angle Glaucoma:The most prevalent one. The drainage angle is not closed, yet the trabecular meshwork becomes less functional over time, resulting in the development of pressure without noise. The majority of patients are asymptomatic until serious optic nerve damage has taken place.
Primary Angle-Closure Glaucoma: The lens bulges excessively in front of the pupil, making it impossible to pass fluid through the pupil. This draws the iris forward, constricting or shutting the drainage angle. It develops gradually or causes a sudden acute attack with intense eye pain, nausea, and rapid vision blurriness, which is sight-threatening and would need prompt emergency treatment.
Secondary Glaucoma: Resultant to a different illness or occurrence that increases the intraocular pressure, such as eye injuries, uveitis, pigmentary dispersion syndrome, or chronic corticosteroid drug use. Therapy is aimed at high eye pressure and the underlying cause.
Congenital Glaucoma: Appears at birth because of an abnormality that occurs in the process of fetal development. Other related disorders are aniridia, Marfan syndrome, the Axenfeld-Rieger syndrome, and neurofibromatosis type 1. The symptoms that are of alarm in infants include excessive tearing, sensitivity to light, cloudy corneas, and large eyes.
What are the Risk Factors of Glaucoma?
Several things can put you at risk of developing glaucoma. Being aware of your risk puts you ahead of it.
Age: Most types of glaucoma affect people aged 40 and older. The prevalence rate is estimated at 10% in people aged 75 years and above. Screening has become more important with age.
Race: African and Afro-Caribbean individuals are prone to higher risk of becoming blind through open-angle glaucoma. The people of Asian and Inuit ancestry are particularly at risk of angle-closure glaucoma.
Sex: Women are more predisposed to angle-closure glaucoma, in part, owing to variations in the anatomy of the eyes.
Refractive Errors: Nearsightedness (myopia) increases the chances of open-angle glaucoma. Angle-closure glaucoma is more dangerous when farsightedness (hyperopia) is present.
Family History:Family history is also a significant contributor to your risk; having a parent, sibling, or child with glaucoma doubles your risk. There are also many conditions leading to secondary glaucoma that are genetically inherited.
Chronic Conditions: Both high blood pressure (hypertension) and diabetes have a substantially increased tendency to develop glaucoma.
Symptoms of Glaucoma?
Although in early glaucoma there may be no symptoms, the subsequent symptoms require immediate attention:
- Presbyopia: progressive impairment of peripheral (side) vision in either eye or both.
- Tunnel vision at an advanced stage- one of the characteristics of extreme visual field loss.
- Acute eye pain, headache, or nausea (angle-closure emergency)
- Problems with vision or seeing blurs or halos around lights.
- A reddish look and immediate loss of vision in one eye.
Management and Treatment
In the treatment of glaucoma, the most important thing is to reduce intraocular pressure to ensure that the condition does not deteriorate. Glaucoma treatment cannot restore lost vision, and therefore, all the treatment is aimed at preserving vision.
Medications
Prescription eye drops, which may decrease the amount of aqueous humor or enhance the capacity to drain via the trabecular meshwork is the initial treatment. When used regularly, they are able to treat glaucoma among individuals who experience ocular hypertension or halt the further development of damage. In some instances, oral medications can also be prescribed.
Consistency is essential- quitting medication without consultation will cause the pressure to increase back, and the optic nerve will be exposed once again.
Glaucoma Surgery
When medications are not enough, surgery becomes necessary. All surgical options aim to improve aqueous humor drainage to bring eye pressure to a safe level. Options include:
- Trabeculectomy- A small opening is created in the eye wall to allow fluid to drain more freely.
- Tube Shunts- A tiny implant creates a new drainage pathway, bypassing the blocked trabecular meshwork.
- Laser Therapy (SLT)- Focused light improves the natural drainage angle with minimal recovery time.
- Minimally Invasive Glaucoma Surgery (MIGS)involves implanting a tiny device to enhance drainage, offering lower risk and faster recovery—ideal for mild to moderate glaucoma.
- The iStent, made by Glaukos (USA), is the world's smallest known medical device implanted in the human body. While the procedure typically costs over Rs. 1.5 lakhs, it was performed at no cost to the patient under the West Bengal Health Scheme (WBHS).
At The Himalayan Eye Institutein Siliguri, Dr. Aroni Chakraborty performs iStent surgery regularly. It's now covered under cashless services from various insurance agencies. This procedure—typically done alongside cataract surgery for mild to moderate open-angle glaucoma—can reduce intraocular pressure (IOP) and decrease or eliminate the need for glaucoma eye drops.
It's a safer, less invasive alternative to traditional surgery, and many glaucoma patients in North Bengal can now benefit from this advanced option.
benefit from this advanced option.
Selecting the Appropriate Treatment
The most appropriate choice will be determined by the type of glaucoma, the stage of the eye condition, and the health condition of the eye. Some patients are treated through drops and do not require any other treatment like laser or surgery; some require a combination of these treatments with medication in a certain time.
Your eye care practitioner at The Himalayan Eye Institute will examine you and will prescribe the course of treatment that best safeguards your vision in the long run. The sooner you are treated, the more the possibilities of saving your vision.
Does Glaucoma have a Prevention?
Glaucoma may be unpreventable, but its development and the loss of sight it brings can be mitigated greatly when appropriate measures are taken.
Have frequent eye-checks: The sole most efficient method of detecting glaucoma before it inflicts irreparable harm is regular checkups. Your vision can be saved.
Know risk factors: Your risk increases by age, family history, race, and chronic diseases such as diabetes and hypertension. If any of them are applicable to you, start screenings sooner and more often.
Regulate pressure of your eyes: In case you are diagnosed with ocular hypertension, you can treat it and avoid the development of glaucoma altogether.
Take medicines as directed: Having glaucoma, regular use of eye drops is the surest means of eliminating any further optic nerve damage and loss of visual field.
Protect your eyes: Secondary glaucoma can be caused by eye injuries. Wear protective eyewear when engaging in sporting activities, construction, or any other activity that poses danger to your eyes.
Lifestyle and culture: Practice a healthy way of living. Long-term eye health can be helped by regular physical activities, a nutritious diet, and controlling blood sugar and blood pressure.
Why The Himalayan Eye Institute is Unique?
Specialist Glaucoma surgeons:Our ophthalmologistsundertake the most up-to-date glaucoma diagnostics and surgical methods, and possess subspecialty training that is rare in this area.
State-of-the-Art Diagnostic Technology:We offer OCT, visual field analysis, and corneal pachymetry to capture the tiniest of nerve damage and nerve fiber loss in the retina - long before any symptoms are detected.
Personalised Care: Each of our treatment plans is tailored to your type of glaucoma, lifestyle, and long-term vision objectives.
Affordable Therapy: We are confident that good eye care is affordable to all. The way our services are designed is in such a way that they are made approachable to patients regardless of their background, without sacrificing clinical excellence.
Community Outreach and Early Screening: We engage in community outreach and early screening by making communities in the region aware of glaucoma and by taking screening camps to underserved areas of the community, since glaucoma will always be best treated early.
Frequently Asked Questions (FAQs)
Q1. Is glaucoma a curable disease?
No, but it can be effectively controlled. Early intervention prevents additional damage to the nerves of the eye and loss of sight - once it is lost, it is forever.
Q2. Is glaucoma hereditary?
Yes. When a parent or a sibling has glaucoma, then your chances are high. Begin screenings at 35-40 years.
Q3. Does glaucoma hurt?
Usually not. The most common type is primary open-angle glaucoma, which is painless until vision loss has progressed. Sudden, severe eye pain is only caused by acute angle-closure glaucoma.
Q4. What is the diagnosis of glaucoma?
By conducting a complete examination of the eye, which involves measuring the eye pressure (tonometry), checking the optic disc, visual field, and OCT nerve fibres. It has no symptoms to depend on, but rather to be detected early on through testing.
A Note from The Himalayan Eye Institute
At the Himalayan Eye Institute, we comprehend that your vision is not merely a sense, but your relation with the world that surrounds you. Glaucoma is a lifelong illness, but with proper management, it does not have to define your life.
Our group of highly qualified glaucoma experts is devoted to early disease detection, treatment, and assistance throughout the entire process. With the state-of-the-art diagnostic equipment and the most current surgical procedures, we introduce the best eye care in the Himalayan Eye Institute .
Be the best at protecting your sight. Believe the professionals in the Himalayan Eye Institute- where caring and clinical care intersect.
