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Diffractive bifocal contact lenses in aphakia and pseudophakia. A pilot study
K Barton1, M H Freeman, E G Woodward
1Contact Lens Department, Moorfields Eye Hospital, London.
Eye (London, England)
|January 1, 1991
Summary
Diffractive bifocal contact lenses offer a dual focus but show low patient acceptance. Many users experienced poor near vision, suggesting limitations for widespread use, especially as intraocular lenses.
Area of Science:
- Ophthalmology
- Optics
- Biomedical Engineering
Background:
- Diffractive bifocal contact lenses utilize diffraction and refraction for simultaneous near and distant vision.
- These lenses manage light by diverting it to two focal points across the entire lens aperture.
Purpose of the Study:
- To evaluate the efficacy and patient satisfaction with diffractive bifocal contact lenses in aphakic and pseudophakic individuals.
- To determine the suitability of these lenses for patients needing correction for both near and far vision.
Main Methods:
- A cohort of fourteen aphakic and pseudophakic contact lens wearers were fitted with diffractive bifocal lenses.
- Participants were observed over an eight-week period to assess visual outcomes and comfort.
Main Results:
- Only 42.8% of participants reported satisfaction with the visual results.
- A significant 35.7% discontinued lens wear due to unsatisfactory near vision quality.
Conclusions:
- Diffractive bifocal contact lenses may assist selected aphakic patients in reducing reliance on reading glasses.
- The low patient acceptance rate indicates potential unsuitability for intraocular lens implantation.