AI Article Synopsis
- The ocular counterroll (OCR) reflex helps adjust eye movements in response to head tilts and varies with age, viewing distance, and target complexity.
- Among 47 participants aged 13-63, older individuals (31+) exhibited lower gains in OCR when viewing distant targets compared to younger individuals (30 and under).
- The study confirmed that distant targets produce greater OCR gains than nearby ones, and target complexity had no significant impact, indicating that visual input mainly aids in maintaining eye alignment during OCR.
Article Abstract
The ocular counterroll (OCR) reflex generates partially compensatory torsional eye movements during static head roll tilt. We assessed the influence of age, viewing distance and target complexity on the OCR across the age span (13-63 years; n=47), by recording eye movements during head-on-body roll tilt (0+/-40 degrees in 5 degrees steps) while subjects viewed simple vs. complex targets at 0.33 and 1m. We found that subjects > or = 31 years had lower gains than those < or =30 years, but only for far targets. Consistent with prior reports, far targets elicited higher OCR gains than near targets, and target complexity had no effect on gains, suggesting that visual input is primarily used to maintain vergence during OCR.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5104536 | PMC |
| http://dx.doi.org/10.1016/j.visres.2009.04.021 | DOI Listing |
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