These subjective and objective test results were compared to characterize changes in accommodative amplitude "from preschool to presbyopia.
For the oldest age group, 51 to 63 years, accommodative amplitude was essentially zero.
The potential accommodative amplitude of passive-shift IOLs is dependent upon the power of the implant (and therefore the patient's refractive error).
Dual optic AIOL designs have been developed to overcome the dependence of potential accommodative amplitude on refractive error (and optic power), which limits single optic AIOLs.
Accommodative responses, including both monocular and binocular accommodative amplitude
, accommodative convergence to accommodation ratio, and negative and positive relative accommodation, were reduced in the TBI population compared with normative values.
In particular, the paper states longitudinal studies that consider the interaction between the preferred reading distance and the change in accommodative amplitude
across time for males and females could help determine to what extent biological factors or environmental factors plays a role in the loss of focusing ability with increasing age.
38 In the same patients, however, the study showed that cyclopentolate was more effective than tropicamide in reducing accommodative amplitude
in adult myopes (near-point testing).
Many of the earlier studies employed accommodative amplitude
as the primary or sole index of accommodative dysfunction.
It has a myriad of unique capabilities, including the wavefront analysis of normal eyes; wavefront analysis of eyes with irregular corneas due to disease or refractive surgery complications; highly reproducible automated refractive error assessment; non-orthogonal astigmatic axis determination; contrast sensitivity assessment; ablation profile mapping; accommodative amplitude
quantification; and its overall capability to perform total visual function analysis.
Accommodation can be measured in several different ways, but at least an assessment of accommodative amplitude
should be included in any child's eye examination.