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BioMed Research International
Volume 2013 (2013), Article ID 154593, 6 pages
Research Article

Vignetting and Field of View with the KAMRA Corneal Inlay

1Experimental Ophthalmology, Saarland University, Kirrberger Strasse 100, Building 22, 66424 Homburg, Germany
2Erlangen Graduate School in Advanced Optical Technologies (SAOT), 91052 Erlangen, Germany
3Department of Ophthalmology and University Eye Clinic, Saarland University Medical Center, 66424 Homburg, Germany

Received 5 September 2013; Accepted 10 October 2013

Academic Editor: Vasilios F. Diakonis

Copyright © 2013 Achim Langenbucher et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Purpose. To evaluate the effect of the KAMRA corneal inlay on the retinal image brightness in the peripheral visual field. Methods. A KAMRA inlay was “implanted” into a theoretical eye model in a corneal depth of 200 microns. Corneal radius was varied to a steep, normal, and flat (7.37, 7.77, and 8.17 mm) version keeping the proportion of anterior to posterior radius constant. Pupil size was varied from 2.0 to 5.0 mm. Image brightness was determined for field angles from −70° to 70° with and without KAMRA and proportion of light attenuation was recorded. Results. In our parameter space, the attenuation in brightness ranges in between 0 and 60%. The attenuation in brightness is not affected by corneal shape. For large field angles where the incident ray bundle is passing through the peripheral cornea, brightness is not affected. For combinations of small pupil sizes (2.0 and 2.5 mm) and field angles of 20–40°, up to 60% of light may be blocked with the KAMRA. Conclusion. For combinations of pupil sizes and field angles, the attenuation of image brightness reaches levels up to 60%. Our theoretical findings have to be clinically validated with detailed investigation of this vignetting effect.