What To Expect From a LASIK Eye Exam

Before calling for a LASIK eye exam, take a moment to learn more about Lasik and PRK.

The free LASIK & PRK eye exam consultation includes many components of the regular eye exam and includes a test to measure the curvature and thickness of the cornea. Dr. Switch is a medical doctor and although it may not be intuitive, many medical conditions affect the eyes as well as the other organs of the body, so be prepared to give a full medical history and be sure to remove your contacts for the week prior to your LASIK eye exam. Your contacts will need to be out for at least one week before this evaluation but make sure to bring in your current eyeglasses and a list of any medications you take.


  1. Visual Acuity (VA). A subjective assessment of your vision is called a Visual Acuity test, or VA. Vision is tested using a standardized eye chart at a specific distance and lighting. The Visual Acuity is recorded as a fraction of the distance over the letter size. Normal vision is recorded as 20/20. Please see the section on Normal vision for further information.
  2. The External Slit Lamp Exam. This portion of the exam involves the structures surrounding the eye and the front portion of the eyeball. The following structures are evaluated: The eyelids, lashes, conjunctiva, iris, cornea, lens and anterior chamber. This exam takes place using a slit lamp biomicrosope and may be supplemented by a Gonioscopy lens if glaucoma is suspected.
  3. Confrontational Visual Fields. This test is used to detect evaluate the patients peripheral vision. Defects in the visual fields may signal the need for further evaluation for conditions such as glaucoma, retinal detachment and or possible neurological problems.
  4. Pupil Reflex Tests. This test uses a small light to test the reflex of the pupil and its ability to constrict and dilate. Abnormalities of this test may signal a problem with the optic nerve or brain.
  5. Ocular Motor Test. In this test, the function of each of the seven eye muscles is tested its ability to conscript and work simultaneously with its fellow muscles in the other eye. Abnormal results may indicate a cranial nerve problem or other pathology of the muscle itself.
  6. Rotations, Versions, Divergence and Convergence. In this test, the eye’s ability to track a moving object will be tests vertically, horizontally and rotationally. Each eye is tested individually and then together. Your eyes will be tested for proper alignment and ability to focus on a target at distance and near.
  7. Direct Ophthalmoscopy. This test allows the examiner to evaluate the internal structures of the eye. This is the only non-invasive test that allows a physician to see the inside of the human body and evaluate the vascular structures and vessels. This test may serve as to detect early disease damage from diabetes, hypertension and other disease affecting the whole body.
  8. Topography. The curvature of the cornea is measured using a simple automated test. Irregularity of the corneal curvature is known as Astigmatism.
  9. Auto-refractometry. Refraction is a measurement of the eyes ability to focus light. The first test is an automated computerized estimate of your glasses prescription.
  10. Corneal Pachymetry. This test evaluates the depth of the patient’s cornea using a small inferred light. It is necessary to evaluate the corneal thickness when considering LASIK or PRK surgery.
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