Related Experiment Video
Updated: Apr 17, 2026
07:06
Binocular Dynamic Visual Acuity in Eyeglass-Corrected Myopic Patients
Published on: March 29, 2022
3.5K
Uncorrected Myopic Refractive Error Increases Microsaccade Amplitude
Fatema F Ghasia1, Aasef G Shaikh2
1Cole Eye Institute Cleveland Clinic, Cleveland, Ohio, United States.
Investigative Ophthalmology & Visual Science
|February 14, 2015
Summary
Visual blur from uncorrected refractive error increases microsaccade amplitude in myopia. This suggests blur influences the calibration of miniature eye movements for clear vision.
Area of Science:
- Ophthalmology
- Neuroscience
- Vision Science
Background:
- Human vision relies on miniature eye movements, like microsaccades, to prevent image fading from visual adaptation.
- Microsaccade generation is influenced by retinal error and visual task demands.
Purpose of the Study:
- To investigate how visual blur, caused by uncorrected refractive error, affects microsaccades and saccades.
- To understand the role of image precision on the fovea in controlling eye movements.
Main Methods:
- Ten myopic subjects participated in two conditions: corrected and uncorrected refractive error.
- High-resolution video oculography recorded eye movements during gaze-holding tasks.
- Analysis focused on gaze stability, microsaccades, and visually guided saccades.
Main Results:
- Microsaccade amplitude significantly increased with uncorrected refractive error.
- Microsaccade frequency and velocity remained unchanged.
- Visually guided saccades (latency, velocity, accuracy) were not affected by refractive error.
Conclusions:
- Visual blur plays a crucial role in calibrating the amplitude of fixational eye movements, including microsaccades.
- Image precision on the fovea is a key factor in regulating microsaccade amplitude.
Related Concept Videos
01:16Focusing of Light in the Eye
7.8K
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...
7.8K
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