Peripheral refraction and retinal contour in stable and progressive myopia

Area of Science:

• Ophthalmology
• Optometry
• Vision Science

Background:

• Myopia, a common refractive error, is characterized by the eye focusing distant objects in front of the retina.
• Understanding the progression of myopia is crucial for developing effective interventions.
• Peripheral refractive errors and eye length are increasingly recognized as factors influencing myopia development.

Purpose of the Study:

• To compare peripheral astigmatic refraction and eccentric eye length between progressing and stable young adult myopes.
• To investigate differences in tangential and sagittal power errors in the periphery.
• To explore the relationship between retinal shape and peripheral refractive patterns.

Main Methods:

• The study included 62 young adult myopes, divided into progressing (P group, n=32) and non-progressing (NP group, n=30) cohorts.
• Groups were matched for age, spherical refraction, and axial length.
• Peripheral refraction and eye length were measured along the horizontal meridian up to 35 and 30 degrees eccentricity, respectively.

Main Results:

• Significant differences in nasal retinal astigmatic components were observed between the P and NP groups (p < 0.001).
• The P group exhibited a hyperopic relative sagittal focus (+1.00 D) at 35 degrees nasal eccentricity, unlike the NP group's myopic focus (-0.10 D).
• Steeper nasal retinal contour in the P group correlated inversely with peripheral refraction, indicating a more hyperopic trend with steeper retinas.

Conclusions:

• Progressing and stable myopes display significant differences in peripheral retinal shape and astigmatic errors, even when matched for key ocular parameters.
• These distinct peripheral characteristics may play a role in regulating ocular growth in myopia.
• Further research into these peripheral differences could inform strategies for myopia control.