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Accommodative response to peripheral stimuli in myopes and emmetropes
Andreas Hartwig1, W Neil Charman, Hema Radhakrishnan
1Faculty of Life Sciences, University of Manchester, Manchester, UK.
Summary
Peripheral retina sensitivity to optical focus was confirmed in myopes and emmetropes, with accommodation responses weakening at higher peripheral angles. Peripheral accommodation appears less effective in myopes but unlikely to significantly impact refractive development.
Area of Science:
- Ophthalmology
- Vision Science
- Refractive Error Research
Background:
- Peripheral refractive error may influence eye growth and axial refractive error development.
- The peripheral retina's sensitivity to defocus is a key area of investigation in understanding visual development.
Purpose of the Study:
- To evaluate the steady-state accommodative response to peripheral visual stimuli in young adult myopes and emmetropes.
- To determine the sensitivity of the peripheral retina to optical defocus.
Main Methods:
- Monocular viewing of eccentric accommodative targets (5°, 10°, 15°) and an axial target.
- Accommodation measurement using an open-field autorefractor.
- Stimulus variation (0-4 D) with spherical trial lenses.
Main Results:
- Peripheral retina sensitivity to optical focus confirmed up to 15° field angles.
- Accommodative responses weakened significantly as the peripheral angle increased.
- Evidence suggests peripheral accommodation may be less effective in myopes compared to emmetropes.
Conclusions:
- Peripheral accommodation can occur without a central stimulus but is typically dominated by it.
- Peripheral accommodation effects are unlikely to play a significant role in refractive development.
- The study highlights the retina's sensitivity to peripheral defocus but questions its impact on refractive error progression.
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