Define:

The "eye" is the organ that allows us to see. It gathers light and sends signals to the brain to create visual images. It has parts like the cornea, iris, lens, retina, and optic nerve that work together for vision.


 1. Refractive Errors:
  • Myopia (Nearsightedness): Distant objects appear blurry due to the light focusing in front of the retina instead of on it.
  • Hyperopia (Farsightedness): Nearby objects are blurry due to the light focusing behind the retina.
  • Astigmatism: Irregular corneal curvature causes distorted and blurred vision.

2. Age-Related Macular Degeneration (AMD):

  • Function: The macula, responsible for central vision, deteriorates over time, leading to loss of sharp, central vision.
  • Types: Dry AMD (gradual thinning of the macula) and Wet AMD (abnormal blood vessel growth beneath the retina).
    Human Eyes
     HUMAN EYE

  • 3. Cataracts:
  • Function: Clouding of the eye's lens, leading to blurred vision.
  • Types: Subcapsular cataracts (back of the lens), nuclear cataracts (center of the lens), cortical cataracts (outer edge of the lens).

4. Glaucoma:

  • Function: Increased intraocular pressure damages the optic nerve, leading to gradual loss of peripheral vision.
  • Types: Open-angle glaucoma and angle-closure glaucoma.

5. Diabetic Retinopathy:

  • Function: High blood sugar levels damage blood vessels in the retina, causing vision problems.
  • Types: Non-proliferative diabetic retinopathy (early stage) and proliferative diabetic retinopathy (advanced stage with abnormal blood vessel growth).

6. Retinal Detachment:

  • Function: The retina separates from its underlying tissue, leading to sudden vision loss.
  • Types: Rhegmatogenous (tear or hole in the retina), tractional (scar tissue pulls the retina), exudative (fluid buildup behind the retina).

7. Conjunctivitis (Pink Eye):

  • Function: Inflammation of the conjunctiva (thin clear tissue over the white part of the eye and inside the eyelids).
  • Types: Viral, bacterial, allergic conjunctivitis.

8. Dry Eye Syndrome:

  • Function: Insufficient tear production or poor tear quality results in dryness, discomfort, and blurry vision.

9. Color Blindness:

  • Function: Impaired ability to distinguish certain colors due to malfunctioning color-sensitive cones in the retina.
  • Types: Red-green color blindness, blue-yellow color blindness, total color blindness (achromatopsia).

10. Uveitis:

  • Function: Inflammation of the uvea (middle layer of the eye), potentially damaging the iris, retina, and other structures.