In the probed-sinewave paradigm—used to study the dynamics of light adaptation—a small probe of light is superimposed on a sinusoidally flickering background. Detection threshold for the probe is measured at various times with respect to the flickering background. Here we present such stimuli using three methods: monoptic (the probe and the flickering background are presented to the same eye), ...

OBJECTIVE To improve the clinical documentation of strabismus by mathematically predicting and clinically verifying the location of a fixation target that produces a vertically centered corneal light reflex (first Purkinje image) in clinical photographs of the eye using a standard photographic flash unit. MATERIALS AND METHODS Mathematical modeling of the corneal light reflex during clinical ...

In the probed-sinewave paradigm-used to study the dynamics of light adaptation-a small probe of light is superimposed on a sinusoidally flickering background. Detection threshold for the probe is measured at various times with respect to the flickering background. Here we present such stimuli using three methods: monoptic (the probe and the flickering background are presented to the same eye), ...

This research aimed to analyze the schematic structure of North Sumatran folktales by using Systemic Functional Linguistic approach and concept narrative genre. Descriptive qualitative methods were used. The data collected through documentation analyzed interactive model proposed Miles, Huberman Saldana. researchers asked English university students write based on in form clauses taken from the...

PURPOSE Historically, Purkinje images have been used to calculate ocular surface curvature and misalignment. The purpose of this report is to introduce an exact ray-tracing program that can be used to examine the influence of ocular component variations on the size and position of Purkinje images I, III, and IV. METHODS Ray tracing was carried out on Le Grand's four-surfaced schematic eye to ...