evaluation of accommodation lag and it's signs and symptoms in some young females

purpose: to evaluate the range of accommodation lag and it's signs and symptoms in 20-25 year-old female students at zahedan medical school, iran. methods: three-hundred female students were enrolled for assessment of accommodation. after exclusion of individuals with individuals with accommodation disorders in 3 steps including amplitude of accommodation, accommodative facility, and relative accommodation; 216 students remained and were assessed for accommodative response and lag. results: of 216 eligible persons, 28 (13%) had no accommodation lag. accommodation lag of other degrees were as follow: +0.25 in 42 (19.4%), +0.50 in 40 (18.5%), +0.75 in 39 (18.1%), +1.00 in 51 (23.6%), +1.25 in 4 (1.9%), +1.5 in 10 (4.6%), and +1.75 in 2 (0.9%). none of the 149 participants with accommodation lag of 0.00 to + 0.75 had any problem. from 51 persons with +1 accommodation lag, 6 (11.8% or 2.8% of total) had eye strain and 4 (2.8% or 1.9% of total) had both burning and eye strain. overall, 4.2% had burning eye strain. conclusion: accommodation lag assessment is a necessary exam for complaints of eye strain and burning.