Recently, there is a well-designed randomized clinical trial with placebo therapy group  investigating effectiveness of vision therapy for accommodation in children with accommodative dysfunction which were defined as having decreased accommodative amplitude with respect to age, accommodative facility, or both and it showed significant improvement in amplitude and facility.
The baseline testing included Convergence Insufficiency Symptom Survey (CISS) questionnaire , visual acuity, cover test at distance and near, accommodative amplitude and facility, Monocular Estimation Method (MEM) retinoscopy , objective assessment of lag of accommodation, near point of convergence, step vergence, vergence facility, and a cycloplegic refraction using 1% Tropicamide.
For these preschool-aged children, the average objectively measured accommodative amplitude
was about half of the subjectively assessed amplitude.
Accommodative amplitude determination: pull-away versus push-up method.
Subjective and objective measurement of human accommodative amplitude. J Cataract Refract Surg, 29(10), 1878-1888.
This testing was conducted at the discretion of the attending optometrist and may have included additional accommodative testing (positive/negative relative accommodation, fused cross cylinder, accommodative amplitudes
, accommodative facility) and vergence testing (distance and near lateral and vertical phorias, distance and near convergence and divergence ranges, vertical vergence ranges).
Five of the patients exhibited accommodative dysfunctions, with all five manifesting reduced accommodative amplitude and two exhibiting slowed accommodative facility .
Minus-lens accommodative amplitude, PRA, and NRA were all determined in the phoropter using the line of 20/30 letters on a reduced Snellen chart .
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.
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.
Phoropters are also used to measure heterophorias, accommodative amplitudes
and accommodative lags/logs/posture, horizontal & vertical vergences and more.
Association between accommodative amplitudes