Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

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...
Photoreceptors and Visual Pathways01:22

Photoreceptors and Visual Pathways

At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category, whereas...
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.
Drugs such as carbonic anhydrase inhibitors, α2- and...
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...

You might also read

Related Articles

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

Sort by
Same author

Inflammatory Response of Presbyopes Neophyte Contact Lens Wearers during 6 Months of Multifocal Lens Wear.

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

Development and Initial Validation of the MCL-PRO-CAT: A computerized adaptive test designed to measure multifocal contact lens performance from the patient's perspective.

Contact lens & anterior eye : the journal of the British Contact Lens Association·2025
Same author

Refractive outcomes after V4c Toric collamer lens implantation over 1y of follow-up.

International journal of ophthalmology·2024
Same author

Content development for a new item-bank for measuring multifocal contact lens performance.

Journal of patient-reported outcomes·2024
Same author

Forward-scattered and backward-scattered light in moderate keratoconus.

Ophthalmic & physiological optics : the journal of the British College of Ophthalmic Opticians (Optometrists)·2023
Same author

Short and long term corneal biomechanical analysis after overnight orthokeratology.

International journal of ophthalmology·2022

Related Experiment Video

Updated: May 29, 2026

Corneal Sensitivity Testing Procedure for Ophthalmologic and Optometric Patients
04:00

Corneal Sensitivity Testing Procedure for Ophthalmologic and Optometric Patients

Published on: August 2, 2024

Straylight and contrast sensitivity after corneal refractive therapy.

Amalia Lorente-Velázquez1, Amelia Nieto-Bona, César Villa Collar

  • 1Department of Optics II, University School of Optics and Clinicas Novovision, Madrid, Spain. alorente@opt.ucm.es

Optometry and Vision Science : Official Publication of the American Academy of Optometry
|August 30, 2011
PubMed
Summary

Corneal refractive therapy improved intraocular straylight after one month. However, this did not correlate with visual acuity or contrast sensitivity, with mesopic vision being more affected.

More Related Videos

Correction of Presbyopia by Monocular Bi-Aspheric Ablation Profile
05:46

Correction of Presbyopia by Monocular Bi-Aspheric Ablation Profile

Published on: September 20, 2024

Comparison of Agreement and Accuracy using Binocular Wavefront Optometer with Autorefractor and Phoropter
05:14

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

Published on: September 16, 2025

Related Experiment Videos

Last Updated: May 29, 2026

Corneal Sensitivity Testing Procedure for Ophthalmologic and Optometric Patients
04:00

Corneal Sensitivity Testing Procedure for Ophthalmologic and Optometric Patients

Published on: August 2, 2024

Correction of Presbyopia by Monocular Bi-Aspheric Ablation Profile
05:46

Correction of Presbyopia by Monocular Bi-Aspheric Ablation Profile

Published on: September 20, 2024

Comparison of Agreement and Accuracy using Binocular Wavefront Optometer with Autorefractor and Phoropter
05:14

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

Published on: September 16, 2025

Area of Science:

  • Ophthalmology
  • Optometry
  • Vision Science

Background:

  • Corneal refractive therapy aims to improve visual function.
  • Assessing visual parameters like straylight and contrast sensitivity is crucial for evaluating treatment outcomes.

Purpose of the Study:

  • To compare intraocular straylight and contrast sensitivity before and after corneal refractive therapy.
  • To evaluate changes at 15 days and 1 month post-treatment.

Main Methods:

  • Prospective, longitudinal study of 30 subjects undergoing corneal refractive therapy.
  • Measurements included straylight (van den Berg meter), contrast sensitivity (VCTS 6500) under photopic and mesopic conditions, and visual acuity (EDTRS charts).
  • Data collected at baseline, 15 days, and 1 month post-treatment.

Main Results:

  • Intraocular straylight significantly decreased from baseline to 1 month post-treatment (p = 0.009).
  • Mesopic contrast sensitivity at high spatial frequencies was significantly reduced, while photopic contrast sensitivity remained stable.
  • No significant correlations were found between straylight and contrast sensitivity or visual acuity measures.

Conclusions:

  • Corneal refractive therapy appears to improve intraocular straylight within one month.
  • Observed improvements in straylight were not directly linked to changes in contrast sensitivity or visual acuity.
  • Mesopic contrast sensitivity demonstrated greater sensitivity to the treatment intervention compared to photopic contrast sensitivity.