What is Partial Blindness?
Partial blindness is defined as a condition in which a person experiences limited vision, which may include blurring, the inability to distinguish shapes, seeing only shadows, poor night vision, or tunnel vision, before becoming completely blind.
Types of Blindness
Partial Blindness: Some vision is still present. This condition is often called "low vision."
Complete Blindness: The inability to see or detect light. This condition is very rare.
Congenital Blindness: This refers to poor vision at birth. Causes include inherited eye and retinal disorders and non-hereditary birth defects.
Legal Blindness: This occurs when central vision is 20/200 in the better eye, even with correction with glasses or contact lenses. Having 20/200 vision means you have to be 10 times closer or an object must be 10 times larger to see it, compared to a person with 20/20 vision. Additionally, you may be legally blind if your field of vision or peripheral vision is severely reduced (less than 20 degrees).
Nutritional Blindness: This term describes vision loss caused by vitamin A deficiency. If vitamin A deficiency persists, damage to the front surface of the eye (xerophthalmia) can occur. This type of blindness can also make it difficult to see at night or in low light because the retinal cells do not function properly.
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