Types of Visual Screening Tests
The following are some types of visual screening tests:
Visual screening tests for an infant:
The following are some of the ways in which your infant's vision can be tested:
response to light
An infant will blink in response to a bright light.
Measuring the response of the pupil (the black center part of the eye) by shining a penlight in the eye is one way to test an infant's vision.
ability to follow a target
The most common vision acuity test in infants is a test to check their ability to look at and follow an object or toy.
visually evoked response testing
These are tests that stimulate the eyes with either a bright light or special pattern. The infant is connected to a special monitor with attachments on the infant's head. The machine then records electrical activity in the brain as the lights and patterns are shown to infants.
Visual screening tests for an older infant and toddler:
Many of the above tests may be performed, in addition to the following:
This test looks for movement and alignment of the eyes that may occur when a child is focusing on an object. One eye is covered with an opaque card while the child stares straight ahead, at which time the examiner observes the uncovered eye.
Visual screening tests for a preschooler:
Some of the same tests that are used for the toddler, in addition to the following, may be used, usually around the age of three:
visual acuity tests
Specific tests and charts may be used to measure both near and distant vision. In the preschooler, these charts may consist of pictures or stories instead of letters of the alphabet.
This test helps determine color blindness in a child.
Visual screening tests for a school-aged children and adults:
In this age group, formal vision tests can be completed with special charts or instruments that aid with testing vision. Both near and far vision can be evaluated.