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Related Concept Videos

Focusing of Light in the Eye01:16

Focusing of Light in the Eye

Light rays enter the eye through the cornea, a transparent dome-shaped tissue that is the eye's outermost layer. The cornea bends or refracts, light rays traveling to the pupil. The shape of the cornea determines how much of the light is bent and whether the image will be focused correctly on the retina at the back of the eye. Once the light has passed through both refraction layers, it converges into a single focal point onto a small area. This is where photoreceptors start transforming...

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Related Experiment Video

Updated: May 14, 2026

Inducement and Evaluation of a Murine Model of Experimental Myopia
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Published on: January 22, 2019

Development of an Optical Defocus-Induced Myopia Model for Guinea Pigs Using Rigid Gas Permeable Contact Lenses.

So Goto1, Sarah Singh, Qiurong Zhu

  • 1Herbert Wertheim School of Optometry and Vision Science, University of California (S.G., S.S., S.A.V., C.W.), Berkeley, CA, USA; Department of Ophthalmology (S.G.), Osaka University Graduate School of Medicine, Suita, Osaka, Japan; Schepens Eye Research Institute (Q.Z.), Massachusetts Eye and Ear, Harvard Medical School, Boston, MA, USA.

Eye & Contact Lens
|May 13, 2026
PubMed
Summary
This summary is machine-generated.

Rigid gas permeable (RGP) contact lenses (CLs) effectively induced myopia and hyperopia in guinea pigs by imposing optical defocus. This study demonstrates RGP CLs as a viable tool for myopia research in animal models.

Keywords:
Contact lensGuinea pigLens-induced myopia

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Area of Science:

  • Ophthalmology
  • Animal Models
  • Myopia Research

Background:

  • Guinea pigs are established mammalian models for studying myopia and ocular growth.
  • Optical defocus is a key modulator of eye elongation in young animals.
  • Spectacle lenses are traditionally used to impose optical defocus in animal studies.

Purpose of the Study:

  • To develop and validate rigid gas permeable (RGP) contact lenses (CLs) as an alternative to spectacle lenses for imposing optical defocus in guinea pigs.
  • To investigate the ocular effects of RGP CLs with varying dioptric powers (-10, 0, +5 D) on eye growth and refractive error.
  • To assess the feasibility of RGP CLs for experimental myopia research.

Main Methods:

  • New Zealand pigmented guinea pigs were used, with RGP lens designs based on corneal shape data.
  • RGP lenses with -10, 0, and +5 diopters (D) were applied for continuous monocular optical defocus.
  • Ocular parameters, including refractive error (RE) and axial length (AL), were measured at baseline and weekly for two weeks.

Main Results:

  • RGP lenses significantly altered refractive error and axial length after two weeks of wear.
  • Eyes fitted with -10 D lenses developed myopia and increased AL, while +5 D lenses induced hyperopia and reduced AL.
  • No significant adverse ocular effects related to CL wear were observed.

Conclusions:

  • Defocusing RGP CLs are a feasible alternative to spectacle lenses for studying eye growth regulation and experimental myopia in guinea pigs.
  • This RGP CL approach has potential applications in investigating myopia control strategies.
  • RGP CLs offer a promising tool for understanding the mechanisms underlying myopia progression.