Visual acuity tests may be done:
- As part of a routine eye exam to screen for vision problems. How often you should have routine eye exams changes as you age. Adults and children and teens have different schedules for eye exams.
- To monitor an eye problem, such as diabetic retinopathy.
- To determine if you need glasses or contact lenses to improve your vision.
- After an injury to the eye.
- When you obtain or renew your driver's license or for some types of employment.
Refraction is done:
- To determine the correct prescription for eyeglasses or contact lenses.
Visual field tests may be done:
- To check for vision loss in any area of your visual field.
- To screen for eye diseases, such as macular degeneration and glaucoma, which cause gaps in the visual field.
- To look for damage to the nerves of the eye following a stroke, head injury or other condition that causes reduced blood flow to the brain.
Color vision tests may be done:
- As part of a routine eye exam.
- To screen for or diagnose color blindness.
- o screen applicants for jobs in which color perception is important, such as truck driving, electronics or the military.
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