Night Blindness

Night Blindness

Night Blindness - What is Night Blindness - Major Causes of Night Blindness - Reasons for Night Blindness | Tips on - Find TipsNyctalopia or Night Blindness, as it is commonly known, is a medical condition marked by the inability to see properly at night or in dim light. It also makes it difficult for the person affected to see when he moves from a brightly lit area to a dimly lit or dark area so driving at night becomes a problem.

The rod cells of the retina help us to see in poor illumination. Any medical condition, causing problem to the retina, can result in night blindness. Night blindness may be present from birth or can be caused later due to injury, some underlying disorder (e.g., myopia, glaucoma) or deficiency of vitamin A. The major causes of night blindness are the following:

Peripheral cortical Cataracts:

This is one of the leading reasons for Nyctalopia, where areas in the lens of the eyes turn opaque. But cataracts are more common in persons above the age of 50.

Vitamin A Deficiency:

Vitamin A is responsible for the production of the pigments in the retina and promotes good vision, specially in low light. Hence a lack of the vitamin results in poor vision.

Retinitis pigmentosa:

This is a disorder where the rods cells in the retina gradually lose their ability to respond to light. Retinitis pigmentosa results in night blindness, Optic atrophy and dotting of the fundus. It is a genetic condition marked by abnormalities of the rods and cones or the retinal pigment epithelium resulting in loss of vision gradually.

Myopia:

Myopia or near-sightedness can also give rise to Nyctalopia.

Other Causes:

Medications for glaucoma, which constrict the pupils, may also give rise to this condition. Other than this there are also such medications, which block the ability of the body to absorb Vitamin A, and thus, they also are responsible for causing night blindness. Some deformities of the retina at birth can also lead to this condition.
Night blindness is treatable if it is diagnosed. Therefore, it is very important to get an accurate diagnosis before looking for a cure. Consult an ophthalmologist as fast as possible to help you get treated.

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