C1 returned eight months after the initial eye examination and reported that: 'PTL help, stop words moving and blurring and stop swirling patterns; has definitely helped school performance.' Colorimetry was not checked at this appointment (as only six months had elapsed) but interestingly when wearing the PTL there was an improvement in
amplitude of accommodation (R12D, L11D) and Randot stereoacuity (shapes 125," circles 40").
These components of the examination were stereo acuity as measured by random dot stereograms (RDSs) using the Randot stereotest, near point of convergence (NPC), ocular alignment at distance and at near determined by cover test, distance phoria (lateral and vertical) and gradient accommodative convergence/accommodation ratio using the von Graefe technique, and the
amplitude of accommodation (AOA) measured by phorometry using the minus lens to blur method.