Also known as vision impairment, vision impairment or vision loss, it can reduce the ability to look at the level of problems that cannot be resolved by simple means such as glasses. Some mirrors or contact lenses also have limited accessibility for those with limited vision. Visual impairment is often defined as better corrected visual acuity than 20/40 or worse than 20/60. The term blindness is used for complete or nearly complete vision loss. Visual impairment can cause people difficulties with routine daily activities such as driving, reading, socializing, and walking.
Visual impaired also known as " visual defects", refers to the varying degrees of vision loss or reduced vision of the eyes caused by various reasons.It is difficulty to do work, learning and other activities that ordinary people can engage in.
Causes of Visual Impairment
1. Congenital Causes
- Family Inheritance
- Marriage of close relatives
- Impact of fetal period
2. Acquired Causes
- Diseases of visual organs
- Systemic disease
- Eye trauma
- Psychogenic factors
3. Other Factors
- Imaging position
- Illumination
- Contrast between object and background
- Eye adaptation state
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