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

Feasibility of lung imaging at 0.55T for assessment of interstitial lung disease in patients with pulmonary sarcoidosis.

European radiology·2026

Same author

AI-Based Opportunistic CT Risk Assessment Using TotalSegmentator in Osteoporotic Vertebral Fractures.

Journal of imaging informatics in medicine·2026

Same author

Assessing Visual Function in Retinal Gene Therapy.

Methods in molecular biology (Clifton, N.J.)·2026

Same author

AI-Based Myocardial Segmentation and Attenuation Mapping Improved Detection of Myocardial Ischemia and Infarction on Emergency CT Angiography.

Bioengineering (Basel, Switzerland)·2026

Same author

Impact of CT dose on AI performance: A comparison of radiomics, deep, and foundation models in a multicentric anthropomorphic phantom study.

Medical physics·2026

Same author

Impact of pulsed stimulation on objective and subjective visual acuity measurements in nystagmus.

Documenta ophthalmologica. Advances in ophthalmology·2025

Same journal

Mesopic Illumination in Natural Environments: Implications for Myopia Research.

Ophthalmic & physiological optics : the journal of the British College of Ophthalmic Opticians (Optometrists)·2026

Same journal

Axial Length Growth Reference Curves and LMS Parameters for Japanese Children and Adolescents Aged 4-20 Years: The TMM BirThree Cohort Study.

Ophthalmic & physiological optics : the journal of the British College of Ophthalmic Opticians (Optometrists)·2026

Same journal

Effect of Switching Myopia Control Strategies on Axial Elongation in Children with Poor Response to Highly Aspherical Lenslet Therapy.

Ophthalmic & physiological optics : the journal of the British College of Ophthalmic Opticians (Optometrists)·2026

Same journal

Quantifying the Role of Longitudinal Chromatic Aberration and Age in Night Vision Disturbances.

Ophthalmic & physiological optics : the journal of the British College of Ophthalmic Opticians (Optometrists)·2026

Same journal

Impaired Rod-Mediated Vision is the Functional Hallmark of Ageing and Early and Intermediate Age-Related Macular Degeneration.

Ophthalmic & physiological optics : the journal of the British College of Ophthalmic Opticians (Optometrists)·2026

Same journal

Analytical Performance, Spatial Dynamics and Clinically Meaningful Change Thresholds for Automated Non-invasive Tear Film Assessment Using the Oculus Keratograph 5M.

Ophthalmic & physiological optics : the journal of the British College of Ophthalmic Opticians (Optometrists)·2026

See all related articles

Search research articles

Related Experiment Video

Updated: May 31, 2026

Binocular Dynamic Visual Acuity in Eyeglass-Corrected Myopic Patients

Binocular Dynamic Visual Acuity in Eyeglass-Corrected Myopic Patients

Published on: March 29, 2022

Subjective visual acuity with simulated defocus.

Anne Dehnert¹, Michael Bach, Sven P Heinrich

¹Sektion Funktionelle Sehforschung, Univ.-Augenklinik, Freiburg, Germany.

Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)

|July 15, 2011

Summary

This summary is machine-generated.

Mathematical stimulus degradation and lens-induced defocus provide similar results for evaluating vision diagnostic equipment. This mathematical method offers accuracy and ease of use, making it a viable alternative.

More Related Videos

Motion-Acuity Test for Visual Field Acuity Measurement with Motion-Defined Shapes

Motion-Acuity Test for Visual Field Acuity Measurement with Motion-Defined Shapes

Published on: February 23, 2024

A Gaze-Contingent Display Framework for Perceptual Learning Research with Simulated Central Vision Loss

A Gaze-Contingent Display Framework for Perceptual Learning Research with Simulated Central Vision Loss

Published on: April 11, 2025

Related Experiment Videos

Last Updated: May 31, 2026

Binocular Dynamic Visual Acuity in Eyeglass-Corrected Myopic Patients

Binocular Dynamic Visual Acuity in Eyeglass-Corrected Myopic Patients

Published on: March 29, 2022

Motion-Acuity Test for Visual Field Acuity Measurement with Motion-Defined Shapes

Motion-Acuity Test for Visual Field Acuity Measurement with Motion-Defined Shapes

Published on: February 23, 2024

A Gaze-Contingent Display Framework for Perceptual Learning Research with Simulated Central Vision Loss

A Gaze-Contingent Display Framework for Perceptual Learning Research with Simulated Central Vision Loss

Published on: April 11, 2025

Area of Science:

Ophthalmology
Optometry
Vision Science

Background:

Artificial vision degradation using dioptric blur is common for diagnostic equipment evaluation.
Lens-induced blur is prone to errors from eyelid squinting, pupil size, and lens positioning.
Mathematical stimulus degradation offers an alternative but may introduce perceptual effects like simultaneous blur.

Purpose of the Study:

To compare the concordance of lens-induced defocus and mathematical stimulus degradation for vision evaluation.
To assess the reliability of mathematical stimulus degradation as a method for inducing artificial vision blur.

Main Methods:

Compared lens-induced defocus and mathematical stimulus degradation in normal subjects.
Measured Landolt C acuity at five defocus levels (0-8 diopters).
Controlled for pupil size, used monochromatic light, and corrected for spectacle magnification.

Main Results:

Both methods yielded similar mean results with minor acuity differences (<0.001 to 0.054 logMAR).
Accounting for lens-related errors minimized discrepancies between the two methods.
The mathematical model's focus on stimulus-only blurring did not negatively impact results.

Conclusions:

Mathematically simulated defocus is a viable and accurate method for vision evaluation.
This technique offers improved ease of use compared to traditional lens methods.
The absence of surrounding blur in the mathematical model does not compromise its effectiveness.