The influence of oblique viewing on axial and peripheral refraction for emmetropes and myopes
Autor: | Ankit Mathur, Sanjeev Kasthurirangan, Suzanna Luong, Wen Linda Lin, Shih Pei Chin, Sock Whay Hoo, Nadine A. Dietz, David A. Atchison |
---|---|
Rok vydání: | 2009 |
Předmět: |
Adult
Refractive error Adolescent Eye Movements genetic structures Eye disease Posture Refraction Ocular Extraocular muscles Vision disorder Young Adult Predictive Value of Tests Myopia medicine Humans Vision Ocular Physics Age Factors Oblique case Middle Aged medicine.disease Sensory Systems Peripheral Ophthalmology medicine.anatomical_structure Autorefractor Head Movements Fixation (visual) Optometry sense organs medicine.symptom |
Zdroj: | Ophthalmic and Physiological Optics. 29:155-161 |
ISSN: | 1475-1313 0275-5408 |
Popis: | Refraction may be affected by the forces of lids and extraocular muscles when eye direction and head direction are not aligned (oblique viewing) which might potentially influence past findings on peripheral refraction of the eye. We investigated the effect of oblique viewing on axial and peripheral refraction. In a first experiment, cycloplegic axial refractions were determined when subjects' heads were positioned to look straight-ahead through an open-view autorefractor and when the heads were rotated to the right or left by 30 degrees with compensatory eye rotation (oblique viewing). Subjects were 16 young emmetropes (18-35 years), 22 young myopes (19-36 years) and 15 old emmetropes (45-60 years). In a second experiment, cycloplegic peripheral refraction measurements were taken out to +/-34 degrees horizontally from fixation while the subjects rotated their heads to match the peripheral refraction angles (eye in primary position with respect to the head) or the eyes were rotated with respect to the head (oblique viewing). Subjects were 10 emmetropes and 10 myopes. We did not find any significant changes in axial or peripheral refraction upon oblique viewing for any of the subject groups. In general for the range of horizontal angles used, it is not critical whether or not the eye is rotated with respect to the head during axial or peripheral refraction. |
Databáze: | OpenAIRE |
Externí odkaz: |