Induced by Nearpoint plus Lenses

Monocular Estimate Method Retinoscopy was used twice to measure the accommodative posture of 211 pre-presbyopic subjects. It was first measured with their farpoint lenses in place, and second, with the farpoint lenses and nearpoint plus lens additions (PLA) in place. The PLAs utilized for the second MEM were based on the binocular cross cylinder findings. The findings from the MEM-twice procedure were used to calculate the change in accommodative response that occurred from the plus lenses. The predominant change was a reduction of accommodation by an amount less than the dioptric power of the PLA, and the mean change was negative accommodation equal to 62% of the PLA. This tendency for incomplete negative accommodation to occur in response to a PLA shifted accommodative posture to less lag or more lead for over 3/4 of the subjects. The changes in accommodative response and posture that are revealed by the MEM-twice procedure are consistent with previous studies of how accommodation changes in response to a nearpoint plus lens. The MEM-twice method is a procedure to determine whether a PLA is indicated or contraindicated for the particular patient.