Correction of peripheral defocus of an eye and control of refractive error development

Abstract

An ophthalmic lens series for reducing the progression of myopia through adequately correcting the peripheral retina, the series comprising more than one ophthalmic lens forming a series. Each ophthalmic lens of the series has a central power level common to the series. Each of the ophthalmic lenses of the series has one differential (peripheral minus central) power level selected from a variety of differential power levels. Providing a variety of differential power levels reduces the risk of over or under-correcting the peripheral retina of a particular eye.

Description

Technical field [0001] The present invention generally relates to the field of ophthalmic devices. In particular, the present invention relates to the field of ophthalmic devices for correcting the peripheral defocus of the eye and controlling the development of refractive errors. Background technique [0002] Myopic eyes are described anatomically as being longer in the axial direction than at the equator, and thus deviated from the spherical shape than the emmetropic eyes. Recently, as described by David Atchinson in "Eye Shape in Emmetropia and Myopia" and Krish Singh in "Three Dimensional Modeling of the Human Eye Based on Magnetic Resonance Imaging", MRI imaging confirmed these findings in living human eyes. Researchers have discovered through automatic refraction that there is a differential peripheral refraction difference between hyperopia, emmetropia, and nearsightedness. Donald Mutti exemplifies this research in "Peripheral Refraction and Ocular Shape in Children". [...

AI Technical Summary

Problems solved by technology

Thus, depending on the individual peripheral defocus of a particular eye, the use of an antimyopic ophthalmic / contact lens with average, unitary, differential lens power will overcorrect the peripheral retina of some myopes and undercorrect the peripheral retina of others

[0007] Severely overcorrected optical effects of the peripheral retina may be additive to myopic peripheral defocus that not only impairs peripheral vision but also causes loss of peripheral form vision leading to further axial eye growth and myopia progression

Undercorrected optical effects can lead to residual hyperopic defocus in the peripheral retina, which also creates stimulation of axial eye growth and worsens myopia

As a result of the above, the use of an antimyopic contact lens having the above average, unitary, differential lens powers to convert peripheral hyperopia to peripheral myopia in the majority of developing myopia may prevent undercorrection in some myopes, but will Serious overcorrection for other nearsighted

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