Types of Visual Screening Tests

In order to evaluate your child's vision, your child's physician will perform a history and physical, including a complete examination of the eyes. There are also many different types of vision tests that can be used to check your child's ability to see. Some of them can be used at any age, while some of them are used based on your child's age and understanding.

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.
• pupil response
  Measuring the response of the pupil (the black center part of the eye) to 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:

• cover/uncover test
  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 3:

• 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.
• color testing
  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.

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