Under close supervision perform preliminary screening examinations for physician review including, but not limited to, visual acuity, history taking, tonometry, lensometry, motility, pupil assessment, visual fields, simple color vision tests, and may perform refraction. Performs basic ophthalmic testing procedures as directed by physician or supervisor including, but not limited to: visual acuity, history taking, tonometry, lensometry, motility, pupil assessment, visual fields, and may perform refraction.