A cataract causes cloudiness or a reduction in the opacity of the clear and transparent lens of the eye. This clouding may obstruct light’s passage to the retina and blurs the vision.
Trachoma is an infection affecting both eyes and is the world’s leading cause of preventable blindness. Trachoma is responsible for the visual impairment of over 2.2 million people and more than half are irreversibly blind.
River blindness (Onchocerciasis) is a disease caused by infection with the parasitic worm Onchocerca volvulus. The parasite is spread by the bites of a black fly that lives near rivers and many bites are usually required for infection.
Macular Degeneration is and age related condition more common in people over 60 and often runs in families. It affects the small central portion of the retina that processes the straight ahead vision needed for reading, driving a car or recognizing faces.
Glaucoma is an optic nerve disorder which has two basic types. 90% of all cases are open-angle glaucoma which is associated with old age. As you grow older the eye becomes less effective at draining excess fluid, this causes pressure to increase gradually which slowly damages the optic nerve and impairs the field of vision.