Ultrasonic measurement of transverse lens diameter during accommodation.
A new method is introduced which makes possible in vivo measurement of transverse lens diameter (T.L.D.) with ultrasound. The horizontal T.L.D. was measured for 7 nearly emmetropic subjects at accommodation stimulus levels of 0,2,4,6 and 8 dioptres. The unaccommodated T.L.D. was found to be proportional to the axial length. The mean unaccommodated T.L.D. was found to be larger than in vitro measurements reported in the literature.
D000065:Accommodation, Ocular; D000328:Adult; D000867:Anterior Chamber / Q000033:anatomy & histology; D000886:Anthropometry / Q000379:methods; D006801:Humans; D007908:Lens, Crystalline / Q000033:anatomy & histology*; D014463:Ultrasonography