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Refractive changes induced by intraocular lens tilt and longitudinal displacement
Archives of Ophthalmology (Chicago, Ill. : 1960)
|January 1, 1986
Summary
Posterior chamber intraocular lenses can tilt or displace after surgery, potentially causing induced spherical and cylindrical refractive errors. Investigation is recommended if significant cylindrical error is detected.
Area of Science:
- Ophthalmology
- Biomedical Engineering
- Optics
Background:
- Posterior chamber intraocular lenses (IOLs) can exhibit tilt and displacement post-implantation.
- Clinical and postmortem studies confirm IOL tilt, often with one end in the lens capsule and the other in the ciliary sulcus.
- Anteroposterior displacement of IOLs is also a recognized complication.
Purpose of the Study:
- To compute the induced spherical and cylindrical refractive errors caused by intraocular lens tilt and displacement.
- To analyze the optical consequences of IOL malposition using a schematic eye model.
Main Methods:
- Utilized a modified Gullstrand schematic eye model.
- Computed induced spherical and cylindrical refractive errors based on simulated IOL tilt and displacement.
Main Results:
- Calculated the degree of spherical and cylindrical refractive errors induced by IOL tilt and/or displacement.
- Quantified the optical impact of common IOL malpositions.
Conclusions:
- Intraocular lens tilt and displacement can induce significant refractive errors.
- Detection of approximately 90 degrees of cylindrical error warrants further investigation into IOL position.