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Image quality of grating target in model eye when viewed through a small-aperture corneal inlay
Makoto Inoue1, Hiroko Bissen-Miyajima1, Hiroyuki Arai1
1From the Kyorin Eye Center (Inoue, Hirakata), Kyorin University School of Medicine, the Department of Ophthalmology (Inoue, Bissen-Miyajima), Tokyo Dental College Suidobashi Hospital, the Department of Ophthalmology (Noda), National Hospital Organization Tokyo Medical Center, Tokyo, the Minatomirai Eye Clinic (Arai), Yokohama, and the Department of Medical System Engineering (Ohnuma), Faculty of Engineering, Chiba University, Chiba, Japan.
Purpose:
To evaluate the quality of the image of a grating target placed in a model eye and viewed through a small-aperture corneal inlay.
Setting:
Kyorin Eye Center, Tokyo, Japan.
Design:
Experimental study.
Methods:
A Kamra corneal inlay was placed on the anterior surface of a fluid-filled model eye, and a United States Air Force target and a calibrated scale were placed on the inner surface of the model eye. With a flat contact lens or a contact or noncontact wide-angle viewing system, the contrast of the grating images and the field of view through the inlay were compared with those without the inlay.
Results:
A blurred dark ring was observed with the flat contact lens and MiniQuad wide-viewing contact lens in the model eye with the inlay. The contrast of the gratings was significantly decreased at 16 cycles/mm (P=.028), 32 cycles/mm (P=.046), and 64 cycles/mm (P=.015). With the Resight noncontact wide-angle viewing system, the field of view was reduced from 62 degrees to 32 degrees when the front lens was at 7.0 mm and slightly reduced from 75 degrees to 62 degrees at 5.0 mm with the inlay.
Conclusions:
The contrast of grating images observed through the inlay was significantly reduced when viewed with the flat contact lens. The field of view through the wide-angle viewing system was also altered. However, the noncontact wide-angle viewing system may be recommended for vitreous surgeries in eyes with the inlay by adjusting the distance of the front lens from the cornea.
Financial Disclosure:
No author has a financial or proprietary interest in any material or method mentioned.
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