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Eye Health Center

Adult Eye Exams

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During Your Eye Exam continued...

Pachymetry: This test uses ultrasound to measure corneal thickness. Thin corneas can lead to falsely low pressure readings and thick corneas can lead to falsely high pressure readings. This test is done just once to create a baseline for future testing. Pachymetry may be needed if you are being considered for corneal surgery.

Pupil dilation (enlargement): With your pupils fully enlarged, the eye doctor will examine the inside of your eyes with different instruments and lights. The pupil-enlarging drops for this part of your eye exam start to work after about 20-30 minutes, making your eyes more sensitive to light and blurring your vision. These effects may last for several hours or longer so it's important to bring a pair of sunglasses to your exam for the ride home.

Visual field test (perimetry): Your visual field is the area you can see in front of you without moving your eyes. Using one of three tests, the eye doctor "maps" what you see at the edges (periphery) of your visual field, using this map in diagnosing your eye condition.

Tips for Finding an Eye Doctor

Here are five ways you can find an eye doctor who is right for you:

  • Ask family or friends which eye doctor they use.
  • Request a referral from your family doctor.
  • Have a hospital or university medical center nearby? Call the department of ophthalmology or optometry for information.
  • Contact state and county academies, associations, or societies of optometrists and ophthalmologists, and ask if they can help you.
  • You may also get a list from your health plan or health insurance company.

WebMD Medical Reference

Reviewed by Alan Kozarsky, MD on February 23, 2014
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