Disorders of crystalline lens

Cataract is a phenomenon in which the lens becomes solid, losing its transparency. People with cataract have a poor and blurred vision, and are at risk of permanent blindness after a long period of time.

Disorders of choroid and retina

Retinopathy is common at all ages. Retinopathy can cause permanent blindness if not diagnosed and treated promptly.

Glaucoma disease

Glaucoma is a common eye condition that causes soreness and impaired vision. Glaucoma can lead to loss of vision if it’s not diagnosed and treated early.

Disorders of ocular muscles, binocular movement, accommodation and refraction
Refractive errors

Refractive errors, also known as myopia, hyperopia, or astigmatism, are abnormalities in one of the optical components of the eye, causing light rays to focus in front or behind the retina, resulting in blurred vision.