What Types of Tests Are Performed During Vision Exams?

by: Advanced Laser | October 11, 2013

Oklahoma City Eye Exam TestsAt Advanced Laser and Cataract Center, Oklahoma City eye doctors John Belardo, Matt Brooks, and Scott Mendell are committed to maintaining and improving the health of patients’ vision. We offer comprehensive vision testing and modern technology to identify eye problems, even when they are in their earliest stages. In cases in which refractive errors, eye diseases, or other issues are diagnosed, we offer effective treatment for qualified candidates.

For our patients in Oklahoma City, routine eye care is the best way to prevent vision impairment and loss. We recommend that patients undergo eye testing every one or two years to maintain the health of their eyes. Patients can expect to undergo the following types of testing during routine eye exams.

Snellen Chart Test

The Snellen chart exam is one of the most commonly used tests. It involves the use of a chart with lines of letters that get progressively smaller as the patient moves down the chart. The patient is positioned 20 feet away from the chart and asked to read as many lines of letters as he or she can see. This test is used to measure visual acuity and the general level of refractive error.

Refraction Test

The refraction test can be performed with a phoropter, autorefractor, or aberrometer. With a phoropter, one eye is covered; patients are shown two lens options and asked which one is clearer. A series of lens sets will be shown until the doctor determines the degree of the refractive error in each eye. An autorefractor identifies the patient’s prescription by measuring the len’s ability to focus light on the retina; the aberrometer uses wavefront technology to detect aberrations in the curvature of the cornea. The autorefractor and aberrometer are quicker and more accurate than the phoropter test.

Visual Field Test

During the visual field test, eye doctors check for blind spots in the patient’s peripheral vision. During this test, patients should stare at a fixed spot in the central field of vision and then tell the doctor when they notice movement in their peripheral field of vision.

Color Blind Testing

Color blindness testing is commonly performed on children and teens to identify the presence of hereditary color vision deficiencies and other eye conditions that could affect the quality of color vision.

Slit Lamp Exam

In the slit lamp exam, a special tool is used to magnify the structures of the eye. The slit lamp is a microscope combined with a slit-shaped beam of light. Eye doctors use this tool to first examine the surface of the eye, including the lids, cornea, iris, and pupil. Then, doctors use the slit lamp to examine the inside of the eye, including the retina, macula, optic nerve, and tear ducts. With the slit lamp exam, a wide range of eye problems can be identified, including dry eye, cataracts, diabetic retinopathy, glaucoma, and macular degeneration.

Pupil Dilation Testing

The pupil dilation test involves the use of special eye drops that cause the pupils to dilate for a few hours. Once the pupils are dilated, the eye doctor may use a slit lamp or another tool to examine the pupil and retina.

Contact Advanced Laser and Cataract Center to schedule an appointment at our practice.