1. Corneal dystrophy: This refers to a group of genetic disorders that cause abnormal deposits of substances in the cornea, leading to vision problems.
2. Corneal ulcer: This is an open sore on the cornea, usually caused by infection or injury. It can cause pain, redness, and blurred vision.
3. Keratoconus: This is a progressive thinning and bulging of the cornea, resulting in a cone-shaped cornea. It can cause distorted vision and may require special contact lenses or surgery for correction.
4. Corneal edema: This is the swelling of the cornea due to fluid accumulation. It can occur as a result of various conditions, such as Fuchs' dystrophy or corneal endothelial dysfunction.
5. Cataract: This is the clouding of the lens inside the eye, leading to blurry vision. It is commonly associated with aging but can also be caused by injury, certain medications, or underlying medical conditions.
6. Lens dislocation: This occurs when the lens of the eye moves out of its normal position. It can be caused by trauma, genetic disorders, or weak supporting structures in the eye.
7. Aphakia: This refers to the absence of the lens in the eye, either due to surgical removal or congenital absence. It requires the use of special contact lenses or intraocular lens implants for vision correction.