Abstract
The purpose of this study was to investigate the effect of optically induced refractive errors on saccade latency and fixation stability.Sixteen healthy, young adults (two males), with normal visual acuity and normal accommodation, performed a saccade task and a fixation task wearing a range of contact lenses (from +3.00 to -5.00 diopters) which induced visual blur and accommodation. The results showed that mean (± standard error) saccade latency was 207 (± 5) milliseconds (ms) and remained stable with both visual blur and accommodation, whereas mean (± standard error) fixation stability was logBCEA 2.48 (± 0.03) (arcmin²) and declined by about 0.09 logBCEA with both visual blur and accommodation. In healthy adults with normal vision, results indicate that recording of saccade latency can be completed accurately regardless of the moderate refractive errors induced in this study. Fixation stability, on the other hand, degrades slightly with blur and with accommodation.
Highlights
Saccade latency refers to the reaction time of a visually guided saccade; it is the time between the appearance of a visual target and the onset of a directional eye movement
We have previously shown that both saccade latency and fixation stability have good internal consistency, reliability and repeatability, which are not influenced by sighting dominance or contact lens wear (Vikesdal & Langaas, 2016)
Visual acuity were measured at the experimental testing distance (1.0 m) and near point of accommodation were measured with a RAF ruler, whilst subjects wore the different experimental lenses
Summary
Saccade latency refers to the reaction time of a visually guided saccade; it is the time between the appearance of a visual target and the onset of a directional eye movement. The latency of visually guided saccades in healthy adults is typically around 200 ms with a standard deviation of about 10% (Holmqvist et al, 2011). Fixation stability can refer to a period of oculomotor stillness, or it can imply perceptual input and processing. Fixation stability is often thought a of as a reflection of attention ability (Rommelse, Van der Stigchel, & Sergeant, 2008). Received July 12, 2016; Published October 28, 2016. Induced refractive errors reduces fixation stability but saccade latency remains stable. Journal of Eye Movement Research, 9(7): .
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