Related Experiment Video
Updated: Jun 7, 2026
05:46
Correction of Presbyopia by Monocular Bi-Aspheric Ablation Profile
Published on: September 20, 2024
Stereoacuity with balanced presbyopic contact lenses
Teresa Ferrer-Blasco1, David Madrid-Costa
1Optometry Research Group (GIO), Optics Department, University of Valencia, C/o Dr Moliner 50, Burjassot, Valencia, Spain. teresa.ferrer@uv.es
Clinical & Experimental Optometry
|November 3, 2010
Summary
The Proclear Multifocal contact lens effectively preserves stereopsis and provides good visual acuity for both distance and near vision in presbyopic individuals. This indicates that multifocal contact lenses minimally impact stereoacuity.
Area of Science:
- Ophthalmology
- Optometry
- Vision Science
Background:
- Evaluation of near stereoacuity in presbyopic subjects using Proclear Multifocal simultaneous vision contact lenses.
- Comparison with traditional correction methods (distance contact lenses with reading spectacles).
Purpose of the Study:
- To assess the impact of Proclear Multifocal contact lenses on near stereoacuity.
- To compare visual acuity and stereopsis between multifocal contact lens wearers and a control group.
Main Methods:
- Twenty-five presbyopic subjects participated in the study.
- Stereoacuity was measured using Howard-Dolman, Titmus, and Random dot stereotests.
- Binocular high-contrast visual acuities (BHCVA) at distance and near were assessed.
Main Results:
- No statistically significant differences in stereoacuity were found between the multifocal contact lens group and the control group across all stereotests (Howard-Dolman, Titmus, Random dot).
- Both groups demonstrated statistically significant differences between Howard-Dolman results and the other two stereotests.
- No significant differences in distance or near BHCVA were observed between the two groups.
Conclusions:
- Proclear Multifocal contact lenses maintain good distance and near visual acuity while preserving stereopsis.
- Simultaneous vision multifocal contact lens optics have a minimal effect on stereoacuity.
Related Concept Videos
01:28Angle 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...
01:16Focusing 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...
01:27Open 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...
Drugs such as carbonic anhydrase inhibitors, α2- and...