18 February 2009 Change in peripheral refraction and curvature of field of the human eye with accommodation
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Proceedings Volume 7163, Ophthalmic Technologies XIX; 716318 (2009) https://doi.org/10.1117/12.812110
Event: SPIE BiOS, 2009, San Jose, California, United States
Recent research showed that the peripheral refractive state is a sufficient stimulus for myopia progression. This finding led to the suggestion that devices that control peripheral refraction may be efficacious in controlling myopia progression. This study aims to understand whether the optical effect of such devices may be affected by near focus. In particular, we seek to understand the influence of accommodation on peripheral refraction and curvature of field of the eye. Refraction was measured in twenty young subjects using an autorefractor at 0° (i.e. along visual axis), and 20°, 30° and 40° field angles both nasal and temporal to the visual axis. All measurements were conducted at 2.5 m, 40 cm and 30 cm viewing distances. Refractive errors were corrected using a soft contact lens during all measurements. As field angle increased, refraction became less hyperopic. Peripheral refraction also became less hyperopic at nearer viewing distances (i.e. with increasing accommodation). Astigmatism (J180) increased with field angle as well as with accommodation. Adopting a third-order aberration theory approach, the position of the Petzval surface relative to the retinal surface was estimated by considering the relative peripheral refractive error (RPRE) and J180 terms of peripheral refraction. Results for the estimated dioptric position of the Petzval surface relative to the retina showed substantial asymmetry. While temporal field tended to agree with theoretical predictions, nasal response departed dramatically from the model eye predictions. With increasing accommodation, peripheral refraction becomes less hyperopic while the Petzval surface showed asymmetry in its change in position. The change in the optical components (i.e. cornea and/or lens as opposed to retinal shape or position) is implicated as at least one of the contributors of this shift in peripheral refraction during accommodation.
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Arthur Ho, Arthur Ho, Frederik Zimmermann, Frederik Zimmermann, Andrew Whatham, Andrew Whatham, Aldo Martinez, Aldo Martinez, Stephanie Delgado, Stephanie Delgado, Percy Lazon de la Jara, Percy Lazon de la Jara, Padmaja Sankaridurg, Padmaja Sankaridurg, "Change in peripheral refraction and curvature of field of the human eye with accommodation", Proc. SPIE 7163, Ophthalmic Technologies XIX, 716318 (18 February 2009); doi: 10.1117/12.812110; https://doi.org/10.1117/12.812110

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