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

Open Angle Glaucoma: Treatment01:27

Open Angle Glaucoma: Treatment

1.1K
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...
1.1K
Angle Closure Glaucoma: Treatment01:28

Angle Closure Glaucoma: Treatment

1.5K
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...
1.5K
Glaucoma: Overview01:25

Glaucoma: Overview

1.6K
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...
1.6K
Focusing of Light in the Eye01:16

Focusing of Light in the Eye

7.0K
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...
7.0K

You might also read

Related Articles

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

Sort by
Same author

Factors affecting color vision: a systematic review.

International journal of ophthalmology·2026
Same author

Comparative study of refractive errors between patients with Parkinson's disease versus age- and sex-matched healthy controls.

BMC neurology·2026
Same author

Comparison of binocular vision indices in Parkinson's disease patients <i>vs</i> age-sex-matched healthy controls.

International journal of ophthalmology·2026
Same author

Using low-dose atropine in control of intermittent exotropia.

Clinical & experimental optometry·2026
Same author

Agreement between Scheimpflug-based optical biometer with partial coherence interferometry in patients with keratoconus.

Scientific reports·2026
Same author

The Effect of Tinted Filters on the Visual Function of Patients with Retinitis Pigmentosa.

Journal of ophthalmic & vision research·2025

Related Experiment Video

Updated: Mar 15, 2026

Subjective Refraction Test Using a Smartphone for Vision Screening
05:36

Subjective Refraction Test Using a Smartphone for Vision Screening

Published on: October 18, 2024

1.9K

Astigmatism in underserved rural areas: a population based study.

Hassan Hashemi1, Payam Nabovati1, Azam Malekifar1

  • 1Noor Research Center for Ophthalmic Epidemiology, Noor Eye Hospital, Tehran, Iran.

Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)
|August 31, 2016
PubMed
Summary

Astigmatism affects 35.6% of Iranians, with prevalence increasing significantly in the elderly. Age and education are key factors, highlighting a need for targeted eye care interventions in rural populations.

Keywords:
against-the-ruleastigmatismobliquerural areaswith-the-rule

More Related Videos

Stereoacuity Improvement using Random-Dot Video Games
06:25

Stereoacuity Improvement using Random-Dot Video Games

Published on: January 14, 2020

15.1K
Comparison of Three Clinical Stereoscopic Methods for Measuring Binocular Visual Function During Amblyopic Treatment in Unilateral Amblyopia
06:19

Comparison of Three Clinical Stereoscopic Methods for Measuring Binocular Visual Function During Amblyopic Treatment in Unilateral Amblyopia

Published on: September 27, 2024

617

Related Experiment Videos

Last Updated: Mar 15, 2026

Subjective Refraction Test Using a Smartphone for Vision Screening
05:36

Subjective Refraction Test Using a Smartphone for Vision Screening

Published on: October 18, 2024

1.9K
Stereoacuity Improvement using Random-Dot Video Games
06:25

Stereoacuity Improvement using Random-Dot Video Games

Published on: January 14, 2020

15.1K
Comparison of Three Clinical Stereoscopic Methods for Measuring Binocular Visual Function During Amblyopic Treatment in Unilateral Amblyopia
06:19

Comparison of Three Clinical Stereoscopic Methods for Measuring Binocular Visual Function During Amblyopic Treatment in Unilateral Amblyopia

Published on: September 27, 2024

617

Area of Science:

  • Ophthalmology
  • Public Health
  • Epidemiology

Background:

  • Astigmatism is a common refractive error affecting vision quality.
  • Understanding its prevalence in diverse populations is crucial for public health planning.
  • Rural and underprivileged areas often face unique challenges in accessing eye care services.

Purpose of the Study:

  • To determine the prevalence of astigmatism in underprivileged rural areas of Iran.
  • To identify factors associated with astigmatism in this population.
  • To inform targeted interventions for vision correction.

Main Methods:

  • Random cluster sampling was used to select two rural areas in Iran.
  • 3851 individuals over one year of age were included in the study.
  • Retinoscopic refraction and demographic data collection were performed; logistic regression analyzed associations.

Main Results:

  • The overall prevalence of astigmatism (≥0.50 D) was 35.6%, with higher rates in men (36.9%) than women (34.0%).
  • Prevalence varied significantly by age, from 13.6% in 6-20 year olds to 82.5% in those over 70.
  • Age and education level were significantly associated with astigmatism; with-the-rule astigmatism decreased with age, while against-the-rule increased.

Conclusions:

  • Astigmatism prevalence in this Iranian rural population is comparable to previous studies.
  • Significant age-related increases in astigmatism, particularly in the elderly, were observed.
  • The high prevalence of uncorrected astigmatism in the elderly warrants attention and intervention.