Related Experiment Videos
Apparent accommodation in pseudophakic eyes as measured with visually evoked potentials
1Department of Ophthalmology, Toyama Medical and Pharmaceutical University, Japan.
Investigative Ophthalmology & Visual Science
|February 1, 1992
Summary
This study found that pseudophakic eyes with posterior chamber intraocular lenses showed similar accommodation amplitudes to normal eyes. Apparent accommodation correlated with pupil size and corneal astigmatism, not patient age or visual acuity.
Area of Science:
- Ophthalmology
- Neuroscience
- Visual Science
Background:
- Pseudophakic eyes, those with intraocular lenses, are common after cataract surgery.
- Understanding the accommodative ability of these eyes is crucial for visual function.
- Posterior chamber intraocular lenses are frequently implanted.
Purpose of the Study:
- To measure apparent accommodation in pseudophakic eyes using visually evoked cortical potentials (VECPs).
- To investigate factors influencing apparent accommodation, including pupillary diameter, corneal astigmatism, age, and visual acuity.
Main Methods:
- Pattern reversal VECPs were used to assess apparent accommodation.
- Measurements were taken in 27 pseudophakic eyes following posterior chamber intraocular lens implantation.
- Patient age ranged from 47 to 83 years.
Main Results:
- Accommodation amplitude in pseudophakic eyes was not significantly different from normal phakic eyes.
- Apparent accommodation showed an inverse relationship with pupillary diameter.
- A significant correlation was found between apparent accommodation and corneal astigmatism.
Conclusions:
- Posterior chamber intraocular lenses support accommodative amplitudes comparable to natural lenses.
- Pupillary diameter and corneal astigmatism are key factors influencing apparent accommodation in pseudophakic eyes.
- Age and corrected visual acuity did not significantly impact measured apparent accommodation.