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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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Glaucoma: Overview

Glaucoma is an eye condition characterized by increased intraocular pressure that damages the retina and optic nerve, leading to irreversible blindness if left untreated. The human eye has various components, including the cornea, iris, pupil, lens, and optic nerve. Aqueous humor is secreted by the epithelium of the ciliary body in the posterior chamber and flows through the trabecular meshwork and canal of Schlemm, maintaining normal intraocular pressure. The trabecular meshwork and the canal...
Angle Closure Glaucoma: Treatment01:28

Angle Closure Glaucoma: Treatment

Angle-closure glaucoma, or closed-angle glaucoma, is an eye condition where the iris bulges out and blocks the iridocorneal angle, resulting in a buildup of aqueous humor and increased intraocular pressure. Immediate medical attention is necessary due to the sudden onset of symptoms. The treatment for angle-closure glaucoma includes short-term and long-term approaches. Short-term treatment involves using eye drops like pilocarpine to lower intraocular pressure by increasing aqueous humor...
Open Angle Glaucoma: Treatment01:27

Open Angle Glaucoma: Treatment

In open-angle glaucoma, the iridocorneal angle remains open, but the trabecular meshwork becomes stiff, slowing down the outflow of aqueous humor. This causes a buildup of aqueous humor in the anterior chamber, leading to a sudden increase in intraocular pressure. The treatment for open-angle glaucoma focuses on reducing the elevated intraocular pressure by either decreasing the secretion of aqueous humor or increasing its outflow.
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Contact Angle01:13

Contact Angle

When a solid is dipped inside a liquid, the liquid surface becomes curved near the contact. For some solid–liquid interfaces, the liquid is pulled up along the solid, while for others, the liquid surface is convex or depressed near the solid surface. This phenomenon can be explained using the concept of cohesive and adhesive forces.
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Related Experiment Video

Updated: Jun 7, 2026

Development of an In Vitro Ocular Platform to Test Contact Lenses
08:28

Development of an In Vitro Ocular Platform to Test Contact Lenses

Published on: April 6, 2016

Gradient-index contact lens.

Y Koike, A Asakawa, S P Wu

    Applied Optics
    |November 6, 2010
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a gradient-index (GRIN) contact lens (CL) to reduce spherical aberration and enhance diopter. The novel GRIN CL material significantly improves vision correction optics.

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    Binocular Dynamic Visual Acuity in Eyeglass-Corrected Myopic Patients
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    Related Experiment Videos

    Last Updated: Jun 7, 2026

    Development of an In Vitro Ocular Platform to Test Contact Lenses
    08:28

    Development of an In Vitro Ocular Platform to Test Contact Lenses

    Published on: April 6, 2016

    Binocular Dynamic Visual Acuity in Eyeglass-Corrected Myopic Patients
    07:06

    Binocular Dynamic Visual Acuity in Eyeglass-Corrected Myopic Patients

    Published on: March 29, 2022

    Area of Science:

    • Ophthalmic optics
    • Materials science

    Background:

    • Spherical aberration and limited diopter adjustment are common issues with conventional contact lenses (CLs).
    • Gradient-index (GRIN) materials offer potential for advanced optical correction.

    Purpose of the Study:

    • To develop and evaluate a gradient-index (GRIN) contact lens (CL) for improved optical performance.
    • To decrease spherical aberration and increase the diopter of contact lenses.

    Main Methods:

    • Fabrication of a plastic radial GRIN rod using vapor-phase diffusion copolymerization.
    • Characterization of the refractive index distribution, revealing a parabolic profile.
    • Preparation of the GRIN CL by grinding and polishing the GRIN rod.

    Main Results:

    • Successfully produced a radial GRIN rod with a parabolic refractive index gradient.
    • Achieved a maximum refractive index difference (Δn) of -0.030.
    • Demonstrated significant improvements in the optical properties of the GRIN CL.

    Conclusions:

    • Radial GRIN materials are effective for enhancing contact lens optical properties.
    • The developed GRIN CL offers a promising solution for reducing spherical aberration and increasing diopter.
    • This technology has the potential to significantly improve vision correction with contact lenses.