Evaluation of the Quality of Peripheral Fundus Images Observed in Vitreous Surgery Through Prism-Type Contact Lenses Using a Surgical Microscope

Abstract

Abstract: : Purpose:To evaluate the quality of peripheral fundus images observed through prism-type vitrectomy contact lenses using a surgical microscope. Methods:Simulated geometrical point spread functions (geometrical PSFs) of peripheral fundus images in several wavelengths that were to be observed through prism-type contact lenses (30°-and 45°-prism vitrectomy lenses) with a surgical microscope (OMS-610; Topcon, Japan) were calculated from optical data using the ray-tracing method. Chromatic aberrations and astigmatism were estimated and compared with those in which the aberrations were corrected with cylindrical lenses for astigmatism and variable prisms for chromatic aberrations in the surgical microscopy system. Results:Astigmatism and chromatic aberrations were significantly induced to degrade the quality of the peripheral fundus images depending on the degrees of the prism in the contact lenses and the magnification. Estimated geometrical PSFs were remarkably improved by correction of the aberrations with a combination of cylindrical lenses and variable prisms. Conclusion:Astigmatism and chromatic aberrations degrade the quality of peripheral fundus images observed through prism-type vitrectomy contact lenses. The quality of the fundus images during vitreous surgery might be improved substantially by correction of these aberrations.

Keywords: 628 vitreoretinal surgery • 500 optical properties