What the risks are:

The tests have no risks.

Special considerations:

If there are any of the following symptoms, have a professional eye examination:

• Difficulty focusing on near objects
• Double vision
• Eye pain
• Feeling like there is a "skin" or "film" over the eye or eyes
• Frequent changing of glasses
• Light flashes, dark spots, or ghostlike images
• Objects or faces looking blurred or foggy
• Rainbow-colored rings around lights
• Straight lines look wavy
• Trouble seeing at night, trouble adjusting to darkened rooms

If children have any of the following symptoms, they should also have a professional eye examination.

• Crossed eyes
• Difficulty in school
• Excessive blinking
• Getting very close to an object (for example, television) in order to see it
• Head-tilting
• Squinting
• Watery eyes