Eye problems cover a wide range, from an annoying bout of conjunctivitis to a retinal detachment that needs surgery within hours. The useful skill is not memorising diseases; it is knowing which symptoms mean wait, which mean book, and which mean go now.
Cataract
Clouding of the lens, causing gradual blur, glare and faded colours. The most common cause of reversible vision loss worldwide, and the treatment — surgical lens replacement — is one of the most effective operations in medicine. Symptoms include halos around lights, worsening night vision, and frequent prescription changes. Nothing nutritional reverses a cataract.
Glaucoma
Optic nerve damage, usually but not always associated with raised eye pressure. Open-angle glaucoma is silent and progressive, eroding peripheral vision first. Acute angle-closure glaucoma is the opposite: sudden severe pain, redness, halos and nausea, and a same-day emergency. Treatment lowers pressure with drops, laser or surgery, and slows progression rather than reversing damage — which is precisely why screening matters.
Age-related macular degeneration
Loss of central retinal function, with distortion of straight lines as an early sign. The dry form is more common and progresses slowly; the wet form can deteriorate quickly and is treated with injections. The AREDS2 formula reduces progression risk in intermediate AMD, which is the one well-established case for a specific supplement combination in eye disease.
Diabetic retinopathy
Retinal blood-vessel damage from sustained high blood sugar. Asymptomatic until it threatens vision, which is why annual screening is standard in diabetes. Tight control is the intervention with the largest effect, supported by laser and anti-VEGF injections once changes appear.
Dry eye, blepharitis and conjunctivitis
The common, uncomfortable and usually benign end of the list. Dry eye is covered separately in dry and irritated eyes. Blepharitis is lid-margin inflammation — crusting, redness, a gritty feeling — managed with lid hygiene and warmth. Conjunctivitis is the pink, watery or sticky eye of infection or allergy; bacterial cases may need drops, viral cases do not, and allergic cases respond to antihistamines.
| Condition | Typical signs | Urgency |
|---|---|---|
| Cataract | Gradual blur, glare, faded colour | Routine referral |
| Open-angle glaucoma | Usually none; gradual field loss | Screening; routine once detected |
| Acute angle-closure glaucoma | Severe pain, redness, halos, nausea | Emergency |
| Dry AMD | Central blur, distortion, slow change | Routine assessment |
| Wet AMD | Rapid distortion, central blur | Urgent — days |
| Diabetic retinopathy | Often none; floaters or blur late | Annual screening |
| Conjunctivitis | Redness, discharge, grittiness | Routine unless painful or vision affected |
| Retinal detachment | Flashes, floaters, curtain across vision | Emergency |
What prevention actually looks like
Less than you might expect and more than most people do. Screening on schedule, blood sugar controlled, no smoking, blood pressure managed, UV protection worn, and symptoms acted on promptly. Our prevention guide covers the evidence, and the routine guide turns it into a schedule.
Frequently asked questionsWhat is the most common eye disease?
Refractive error is the most common vision problem overall; cataract is the most common treatable eye disease, and dry eye the most common cause of everyday discomfort.Can eye diseases be prevented?
Some risk can be reduced — diabetic retinopathy through control and screening, glaucoma progression through early detection, cataract and AMD partly through smoking cessation and UV protection. None is fully preventable.Is glaucoma painful?
Open-angle glaucoma is painless and silent. Acute angle-closure glaucoma is intensely painful and is an emergency.Can I have 20/20 vision and still have eye disease?
Yes. Glaucoma and early diabetic retinopathy routinely coexist with normal acuity. Only an examination finds them.How is macular degeneration detected?
Dilated examination, optical coherence tomography and, for home monitoring, an Amsler grid to catch distortion early.
What is the most common eye disease?
Can eye diseases be prevented?
Is glaucoma painful?
Can I have 20/20 vision and still have eye disease?
How is macular degeneration detected?
References
- National Eye Institute. Cataracts. Source
- National Eye Institute. Glaucoma. Source
- National Eye Institute. Diabetic retinopathy. Source
- National Eye Institute. Age-related macular degeneration (AMD). Source
- Age-Related Eye Disease Study Research Group. A randomized, placebo-controlled, clinical trial of high-dose supplementation with vitamins C and E, beta carotene, and zinc for age-related macular degeneration and vision loss: AREDS report no. 8. Archives of Ophthalmology. 2001;119(10):1417–1436. Source
- Age-Related Eye Disease Study 2 Research Group. Lutein + zeaxanthin and omega-3 fatty acids for age-related macular degeneration: the Age-Related Eye Disease Study 2 randomized clinical trial. JAMA. 2013;309(19):2005–2015. Source
- GBD 2019 Blindness and Vision Impairment Collaborators. Trends in prevalence of blindness and distance and near vision impairment over 30 years. The Lancet Global Health. 2021;9(2):e130–e143. Source
- BrightFocus Foundation. Macular degeneration research overview. Source
Links open in a new tab. Citations are provided for ingredient and background research only. No published trial has tested the finished EyeFortin formula.