Pre-refraction procedures

Pre-refraction procedures

Pre-refraction procedures, such as the measurement of vision or visual acuity and cover testing, are usually performed before the optimum refractive correction is determined. When patients habitually wear spectacles these procedures are conducted with the patient wearing those spectacles, if they have brought them to the examination. Where a patient does not have spectacles these procedures are conducted without any refractive correction in place. When patients wear spectacles for some visual tasks but not others some procedures may need to be done with spectacles and others without.

Pre-refraction procedures