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...

You might also read

Related Articles

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

Sort by

Same author

[Basic Principles of Optics].

Klinische Monatsblatter fur Augenheilkunde·2018

Same author

[Spectacle Glasses - an Overview].

Klinische Monatsblatter fur Augenheilkunde·2017

Same author

Refractive errors.

Deutsches Arzteblatt international·2016

Same author

Effect of induced transverse chromatic aberration on peripheral vision.

Journal of the Optical Society of America. A, Optics, image science, and vision·2015

Same author

Dynamic architecture of a minimal RNA polymerase II open promoter complex.

Molecular cell·2012

Same author

Bayesian-inference-based fluorescence correlation spectroscopy and single-molecule burst analysis reveal the influence of dye selection on DNA hairpin dynamics.

Chemphyschem : a European journal of chemical physics and physical chemistry·2012

Same journal

Comparison of neutralization and disinfection kinetics in povidone iodine- and hydrogen peroxide-based soft contact lens care solutions.

Optometry and vision science : official publication of the American Academy of Optometry·2026

Same journal

Agreement between ganglion cell-inner plexiform layer metrics from widefield optical coherence tomography and Goldmann II, III, and V in glaucoma.

Optometry and vision science : official publication of the American Academy of Optometry·2026

Same journal

Repeatability of SpotChecks contrast sensitivity test in macular disease.

Optometry and vision science : official publication of the American Academy of Optometry·2026

Same journal

Reflections on emerging therapies for inherited retinal diseases following a community education event: A qualitative exploration.

Optometry and vision science : official publication of the American Academy of Optometry·2026

Same journal

Optical myopia control interventions: Evaluation of methods and success in a real-world population.

Optometry and vision science : official publication of the American Academy of Optometry·2026

Same journal

Influence of corneal endothelial cell density after penetrating keratoplasty on contact lens induced corneal swelling.

Optometry and vision science : official publication of the American Academy of Optometry·2026

See all related articles

Search research articles

Related Experiment Video

Updated: Mar 10, 2026

$Comparison of Agreement and Accuracy using Binocular Wavefront Optometer with Autorefractor and Phoropter$

Comparison of Agreement and Accuracy using Binocular Wavefront Optometer with Autorefractor and Phoropter

Published on: September 16, 2025

Personalized Progressive Addition Lenses: Correlation between Performance and Design.

Johanne Forkel¹, Jenny Lorén Reiniger, Adam Muschielok

¹*MSc †Dr. rer. nat. Faculty of Ophthalmic Optics and Psychophysics, University of Applied Sciences Aalen, Aalen, Germany (JF, JLR, PB); and Corporate Research and Development, Rodenstock GmbH, München, Germany (AM, AW, AS).

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

|December 6, 2016

Summary

This summary is machine-generated.

Personalized progressive addition lenses (PALs) offer superior comfort and tolerability compared to conventional designs. Customization within a design space significantly impacts visual performance, with most users preferring personalized options.

More Related Videos

Binocular Dynamic Visual Acuity in Eyeglass-Corrected Myopic Patients

Binocular Dynamic Visual Acuity in Eyeglass-Corrected Myopic Patients

Published on: March 29, 2022

$Author Spotlight: Advancements in Refractive Surgical Correction for Presbyopia and Exploring Postoperative Visual Acuity$

Author Spotlight: Advancements in Refractive Surgical Correction for Presbyopia and Exploring Postoperative Visual Acuity

Published on: September 20, 2024

Related Experiment Videos

Last Updated: Mar 10, 2026

$Comparison of Agreement and Accuracy using Binocular Wavefront Optometer with Autorefractor and Phoropter$

Comparison of Agreement and Accuracy using Binocular Wavefront Optometer with Autorefractor and Phoropter

Published on: September 16, 2025

Binocular Dynamic Visual Acuity in Eyeglass-Corrected Myopic Patients

Binocular Dynamic Visual Acuity in Eyeglass-Corrected Myopic Patients

Published on: March 29, 2022

$Author Spotlight: Advancements in Refractive Surgical Correction for Presbyopia and Exploring Postoperative Visual Acuity$

Author Spotlight: Advancements in Refractive Surgical Correction for Presbyopia and Exploring Postoperative Visual Acuity

Published on: September 20, 2024

Area of Science:

Ophthalmic optics
Vision science
Human factors in optics

Background:

Progressive addition lenses (PALs) are crucial for correcting presbyopia.
Conventional PALs have fixed designs, potentially limiting visual optimization for individual needs.
A continuously controllable design space for PALs offers a novel approach to personalization.

Purpose of the Study:

To investigate a continuous design space for personalized PALs.
To evaluate how personalized PAL perception varies with design space position.
To compare personalized PAL performance against conventional fixed-design PALs.

Main Methods:

A double-blind study involving 51 subjects comparing personalized (Rodenstock Impression FreeSign 3) and conventional (Rodenstock Progressiv Life Free) PALs.
Customization of viewing zones and gradient softness based on individual preferences.
Subjective ratings and experimental measurements of visual zone widths, blur, distortion, and comfort.

Main Results:

Personalized lens design position significantly influenced far viewing zone width, blur gradient smoothness, and distortion.
82% of subjects preferred the personalized lenses over conventional ones.
Subjects reported enhanced wearing comfort and tolerability with personalized PALs.

Conclusions:

Personalized PAL designs were perceived as intended, validating the customization approach.
Optimization for individual wearing conditions and personalization are key factors in user preference.
Personalized PALs demonstrate a significant advantage in user satisfaction and visual experience.