These binocular vision procedures go beyond those traditionally undertaken in a routine eye examination. In this section there are videos demonstrating how to determine the level of accommodative lag, assess accommodative facility, determine the presence of central scotoma and eccentric fixation in small heterotropia, and determine the magnitude of heterophoria and differentiating between comitant and incomitant deviations.
In MEM dynamic retinoscopy the amount of the lag of accommodation is estimated by judging the width, speed and brightness of the retinoscopic reflex with refractive correction in place. The dioptric power of the lens that provides neutrality is equal to the accommodative lag or in some cases acco...
Low neutral dynamic retinoscopy yields the lens power with which the dioptric accommodative stimulus and dioptric accommodative response are equal.
This is a measure of the speed of accommodative change. The dioptric accommodative stimulus is alternated between two different levels and the subject reports when a letter target is seen clearly after each alternation in accommodative stimulus. The examiner counts the number of cycles completed ...
Each plane glass lens has fine parallel striations inscribed onto the surface orientated at 45 degrees on one lens and 135 degrees on the other. A spotlight is converted into a line image seen at 90 degrees to the striations when viewed through the lenses. The test is useful with differential dia...
Shine a Visuscope beam target through the pupil of the suspect eye and cover over the patient’s good eye with a hand. Focus the Visuscope target on to the retina and ask the patient to look at the centre of this target. Compare the position of patient’s foveal reflex with the centre of the target...
This test provides further information about the vergence system and is especially useful for those patients that have with symptoms associated with near work.
