Visual acuity shall be tested at the Snellen chart, arranged for a distance of 5 meters. The tablet should be evenly and well illuminated from artificial light source must be such that direct light from this does not interfere with the person to be examined. It must not fall direct sunlight on the board or its immediate surroundings. The room where the investigation takes place must not be brightly illuminated. On examination shall first be tested each eye separately. In these studies it is not allowed to wear glasses, contact glass or other artificial optical aids. For losaspiranter should refraction determined for each eye. The field of view must be examined separately for each eye Donders method.
pardon my google
I dont need glasses, ive got the eyes of an eagle