Related Experiment Video
Updated: Apr 20, 2026
08:27
Quantification of Oculomotor Responses and Accommodation Through Instrumentation and Analysis Toolboxes
Published on: March 3, 2023
1.6K
Changes in anterior chamber eye during accommodation as assessed using a Dual Scheimpflug system
Alberto Domínguez-Vicent1, Daniel Monsálvez-Romín1, César Albarrán-Diego1
1Optometry Research Group, Department of Optics, University of Valencia, Spain.
Arquivos Brasileiros De Oftalmologia
|November 21, 2014
Summary
Anterior chamber angle and pupil diameter change significantly with accommodation, but anterior chamber depth does not. The anterior chamber is asymmetrical, with the nasal-superior region shallower than the inferior-temporal region.
Area of Science:
- Ophthalmology
- Optometry
- Anatomical Optics
Background:
- Accommodation is a crucial visual function involving changes in the eye's optical properties.
- Understanding dynamic changes in ocular structures during accommodation is vital for diagnosing and managing various eye conditions.
Purpose of the Study:
- To investigate the dynamic changes in anterior chamber depth (ACD), anterior chamber angle (ACA), and pupil diameter (PD) during accommodation.
- To assess the impact of varying accommodation stimuli on these anterior segment parameters.
Main Methods:
- Eighty eyes from 80 healthy subjects (aged 22-40) were analyzed.
- A rotating Dual Scheimpflug and Placido disc system (Galilei G4) was employed for measurements.
- ACD, ACA, and PD were recorded at different accommodation levels (+1 D to -4 D) and various ocular positions.
Main Results:
- Anterior chamber depth (ACD) showed no significant variation with accommodation; central ACD changed by -4.11%.
- Anterior chamber angle (ACA) was significantly lower in inferior, temporal, and superior quadrants, but not in the nasal quadrant or for the whole eye.
- Pupil diameter (PD) decreased significantly with accommodation, with a relative change of -8.13% at -4 D stimulus.
Conclusions:
- Accommodation significantly affects ACA and PD, but not ACD.
- The anterior chamber exhibits asymmetry, with the nasal-superior region being shallower than the inferior-temporal region.
Related Concept Videos
01:16Focusing of Light in the Eye
7.9K
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...
7.9K
01:15Depth Perception and Spatial Vision
2.7K
Depth perception is the ability to perceive objects three-dimensionally. It relies on two types of cues: binocular and monocular. Binocular cues depend on the combination of images from both eyes and how the eyes work together. Since the eyes are in slightly different positions, each eye captures a slightly different image. This disparity between images, known as binocular disparity, helps the brain interpret depth. When the brain compares these images, it determines the distance to an object.
2.7K
01:25Glaucoma: Overview
1.7K
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...
1.7K
01:28Angle Closure Glaucoma: Treatment
1.7K
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...
1.7K
01:27Open 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...
Drugs such as carbonic anhydrase inhibitors, α2- and...
1.1K