What is the primary reason to have patients remove their contacts before the 3-in-1 testing?

The primary reason for having patients remove their contacts before conducting the 3-in-1 testing is to ensure accurate measurements. Contact lenses can cause changes in the shape of the cornea and affect how light enters the eye, potentially leading to unreliable test results. Accurate measurements are crucial, particularly in determining visual acuity, refractive errors, and conducting other eye assessments that require a clear view of the eye's natural state. By removing contact lenses, which can alter the normal physiology of the eye, optometric technicians can obtain precise data needed for further evaluation and treatment.

While concerns about contact degradation and allergic reactions are valid considerations, they are not the primary focus during the testing process. Additionally, legal requirements may vary by location, but in most cases, the emphasis is on obtaining accurate diagnostic information.