DARK-ADAPTATION FOR TESTING MESOPIC VISUA L-ACUITY WITH TRENDELENBURGSPECTACLES

Dark adaptation for testing visual acuity under mesoptic conditions ca n be accomplished with Trendelenburg spectacles. The spectacle frames are in contact with the ficial skin at all points, forming a light-tig ht seal so that no stray light reaches the eyes. The lenses are red fi lters, admitting no light below 630 nm. When these spectacles are used , adaptation can be performed in a normally lit room.