According to area optometrists, a complete examination for contact lenses ideally should cover:
1. Case history: general health, occupation, previous contact lens history, susceptibility to allergies or sinus infections, medications, past medical or vision problems, family medical history.
2. Internal health of the eye: done with an ophthalmoscope (hand-held microscope), to examine inside of the eyes. These series of tests check for cataracts, retinal diseases, hypertension, diabetes, etc.
3. External health of the eye: checking muscle coordination, lids, cornea, pupils, depth perception, color vision.
4. Aided and unaided visual acquity: reading the chart with present prescription and with none.
5. Curvature of the cornea: done with ophthalmometer, determines base finding for the initial shape of contact lens.
6. Slit lamp or biomicroscopy: checks for defects in the cornea and front of the eye and makes sure the eye is producing adequate tear film.
7. Refractive status: done with a refractor to determine prescription. Visual function testing may be done at this time to determine how eyes work together with new prescription.
8. Glaucoma screening test or tonometry test: check for signs of the disease.
9. Visual field: tests for sensitivity of nerves in back of the eye.
10. Diagnostic lens fitting: by trying different lenses, the best fit and appropriate lens manufacturer are determined. The type of lens needed is dependent on tear level, curvature of the eye, weight and cover of the lid. The doctor should observe how they fit, how they move and generally how the eye handles the lens.