Ability to use equipment, perform tests and read results, as needed, including: visual acuity, extra ocular motility, pupil evaluation, confrontational fields, color vision, stereo vision, tonopen/applanation tonometry, lensometry, keratometry, eye irrigation, refractometry, manual a-scan measurements, topography, brightness acuity testing, and slit lamp examination. Even though the weight lifted may be only a negligible amount, a job should be rated Light Work: (1) when it requires walking or standing to a significant degree; or (2) when it requires sitting most of the time but entails pushing and/or pulling of arm or leg controls; and/or (3) when the job requires working at a production rate pace entailing the constant pushing and/or pulling of materials even though the weight of those materials is negligible.