Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

Focusing of Light in the Eye

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...

Angle Closure Glaucoma: Treatment

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: Treatment

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.
Drugs such as carbonic anhydrase inhibitors, α2- and...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by

Same author

Improving interpupillary distance accuracy in the plusoptix A12R: A distance-dependent correction.

Journal of optometry·2026

Same author

Jacobi-Fourier phase masks as ophthalmic elements to correct presbyopia.

Ophthalmic & physiological optics : the journal of the British College of Ophthalmic Opticians (Optometrists)·2024

Same author

Attraction of Insects to Ornamental Lighting Used on Cultural Heritage Buildings: A Case Study in an Urban Area.

Insects·2022

Same author

Think globally, act locally: Quality improvement as a catalyst for COVID-19 related care during the transitional years.

Journal of pediatric rehabilitation medicine·2021

Same author

Suitability of DIALux for designing UVC disinfection cabins.

Applied optics·2021

Same author

What should be done to the measured Zernike coefficients when conjugating the pupil and wavefront sensor planes with a 4f system: discussion.

Journal of the Optical Society of America. A, Optics, image science, and vision·2021

Search research articles

Related Experiment Video

Updated: May 28, 2026

Correction of Presbyopia by Monocular Bi-Aspheric Ablation Profile

Published on: September 20, 2024

Adaptive astigmatism-correcting device for eyepieces.

Justo Arines¹, Eva Acosta

¹Area de Óptica, Departamento de Física Aplicada, Facultad de Física, Universidad de Santiago de Compostela, Spain.

Optometry and Vision Science : Official Publication of the American Academy of Optometry

|October 11, 2011

Summary

This study presents an inexpensive, robust device for correcting variable astigmatism using two ophthalmic lenses. The system effectively corrects eyepiece astigmatism without introducing aberrations, offering a customizable solution for diverse users.

Related Experiment Videos

Last Updated: May 28, 2026

Correction of Presbyopia by Monocular Bi-Aspheric Ablation Profile

Published on: September 20, 2024

Area of Science:

Optics
Ophthalmology
Optical Engineering

Background:

Astigmatism is a common refractive error affecting vision.
Existing astigmatism correction methods can be costly or complex.
Eyepieces in optical instruments often require astigmatism correction.

Purpose of the Study:

To describe the construction of a low-cost, robust variable astigmatism-correcting device.
To utilize identical commercial ophthalmic lenses for astigmatism correction.
To provide a customizable solution for eyepiece astigmatism.

Main Methods:

Constructing a device using two identical cross-cylinder ophthalmic lenses.
Achieving variable astigmatism power through relative lens rotation.
Allowing astigmatism axis adjustment via ensemble rotation.

Main Results:

The device corrects astigmatism for eyepieces, compensating prescriptions from -8.00 D to 0.00 D.
No higher-order aberrations were generated.
Mean sphere power remained consistently near 0 D.
The system demonstrated robustness against minor misalignments.

Conclusions:

An inexpensive and robust variable astigmatism device for eyepieces can be manufactured from two equal ophthalmic lenses.
The device is robust, with minimal impact on sphere power and no generation of higher-order aberrations from small misalignments.
This adaptable device offers a unique solution for a wide range of users.