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Defects of Vision

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1) Conjunctivitis/Pink eye: It is the inflammation of the conjunctiva.

2) Myopia/Short-sightedness: It is a defect in which a person can see only those objects that are close to his/her eye. It produces blurred vision. It is caused due to elongation of the eyeball or thickened lens.

3) Hypermetropia/Far-sightedness: It is a defect in which a person cannot see nearer objects clearly but can see farther objects.

4) Astigmatism: It is a defect in which light rays do not converge at the retina and the vision becomes blurred. It is caused due to irregular lens or irregular retina.

5) Cataract: It is a disease in which the eye lens becomes opaque.

6) Glaucoma: It is a disease in which intraocular pressure is raised above normal level and loss of vision occurs gradually.

7) Presbyopia: It is a defect in which the lens is not able to focus images of nearer objects due to old age.

8) Colour blindness: It is the inability to recognize one or more colors due to deformity in cone cells.