For ametropic eyes, LASIK is a common surgical procedure to correct the refractive error. However, the correction of hyperopia is more difficult than that of myopia because the increase of the central corneal curvature by excimer ablation is only possible by intrastromal tissue removal within a ring-like zone in the corneal periphery. For high hyperopia, the ring-shaped indentation leads to problems with the stability and reproducibility of the correction due to epithelial regrowth.
Recently, it was shown that the correction of hyperopia can be achieved by implanting intracorneal inlays into a laser-dissected intrastromal pocket. In this paper we demonstrate the feasibility of a new approach in which a transparent, and biocompatible liquid filler material is injected into a laser-dissected corneal pocket, and the refractive change is monitored via OCT. This technique allows for a precise and adjustable change of the corneal curvature.
Precise cutting of the intrastromal pocket was achieved by focusing UV laser picosecond pulses from a microchip laser system into the cornea. After laser dissection, the transparent filler material was injected into the pocket. The increase of the refractive power by filler injection was evaluated by taking OCT images from the cornea. With this novel technique, it is possible to precisely correct hyperopia of up to 10 diopters. An astigmatism correction is also possible by using ellipsoidal intrastromal pockets.
Sebastian Freidank, Alfred Vogel, Richard R. Anderson, Reginald Birngruber, and Norbert Linz, "Correction of hyperopia by intrastromal cutting and biocompatible filler injection (Conference Presentation)," Proc. SPIE 10045, Ophthalmic Technologies XXVII, 100451J (Presented at SPIE BiOS: January 30, 2017; Published: 16 May 2017); https://doi.org/10.1117/12.2252776.5370275070001.
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