Your eyes are essential for navigating the world, making eye health a top priority. Many serious eye conditions are “silent,” meaning they don’t show symptoms until vision loss has already occurred.
This guide describes the top 10 most common eye diseases with visual references from the NHS and Wikipedia.
Conjunctivitis is the inflammation of the conjunctiva, the thin, clear tissue that lies over the white part of the eye and lines the inside of the eyelid.
Causes: Bacterial or viral infections, allergies (hay fever), or irritants like chlorine and smoke.
Symptoms: Redness, itchiness, and a gritty feeling, often accompanied by a discharge that forms a crust during the night.
A cataract is a clouding of the eye’s natural lens, which lies behind the iris and the pupil. It is the most common cause of vision loss in people over age 40.
Causes: Primarily aging, but also diabetes, trauma, or long-term steroid use.
Symptoms: Blurry vision, faded colors, and increased glare from lights at night.
Dry eyes occur when your tear glands don’t produce enough tears, or produce poor-quality tears, leading to a lack of lubrication for the eye surface.
Symptoms: Stinging, burning, redness, and a sandy feeling in the eyes. Chronic dry eye can sometimes lead to corneal damage if untreated.
Uveitis is inflammation of the uvea—the middle layer of the eye that provides most of the blood supply to the retina.
Causes: Autoimmune disorders (like Sarcoidosis or Lupus), infections (Herpes, TB), or eye trauma.
Warning: Uveitis is a potentially blinding condition and requires urgent management by an ophthalmologist.
A complication of diabetes that affects the blood vessels in the retina (the light-sensitive tissue at the back of the eye).
Cause: High blood sugar levels damage the tiny blood vessels, causing them to leak fluid or bleed.
Prevention: Strict blood sugar and blood pressure control, along with regular retinal screenings.
In this condition, the cornea thins and gradually bulges outward into a cone shape.
Symptoms: Blurred vision and sensitivity to light. Because the cornea is misshapen, it cannot focus light correctly.
Outcome: If diagnosed early, it can be managed with special contact lenses; advanced cases may require a corneal transplant.
AMD is a leading cause of vision loss, characterised by the breakdown of the macula, which is responsible for sharp, central vision.
Types: “Dry” AMD (thinning of the macula) and “Wet” AMD (abnormal blood vessel growth).
Symptoms: A blurry spot in the center of your vision or straight lines appearing wavy.
Myopia is a common vision condition where you can see objects near you clearly, but objects farther away are blurry.
Cause: The eyeball is too long or the cornea is too curved, causing light to focus in front of the retina instead of on it.
Often called the “silent thief of sight,” glaucoma is a group of eye conditions that damage the optic nerve, often due to abnormally high pressure in the eye.
Risk: It is a leading cause of blindness for people over 60. Most forms have no early symptoms, making regular eye exams vital.
Presbyopia is the gradual loss of your eyes’ ability to focus on nearby objects. It is a natural, often annoying part of aging.
Cause: The lens inside the eye becomes less flexible over time, usually becoming noticeable in your early to mid-40s.
Retinal Detachment: An emergency situation where the retina pulls away from its supportive tissue. Symptoms include sudden flashes of light or a “curtain” falling over your vision.
Floaters: Small specks or “cobwebs” that drift through your field of vision. While usually harmless, a sudden increase in floaters can indicate a retinal tear.
Routine eye exams are the best way to catch these diseases early. If you experience sudden changes in vision, pain, or redness, contact an eye specialist immediately.
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