Correction of hyperopia by intrastromal cutting and liquid filler injection

Sebastian Freidank, Alfred Vogel, R. Rox Anderson, Reginald Birngruber, Norbert Linz


Correction of hyperopia requires an increase of the refractive power by steepening of the corneal surface. Present refractive surgical techniques based on corneal ablation (LASIK) or intrastromal lenticule extraction (SMILE) are problematic due to epithelial regrowth. Recently, it was shown that correction of low hyperopia can be achieved by implanting intracorneal inlays or allogeneic lenticules. We demonstrate a steepening of the anterior corneal surface after injection of a transparent, liquid filler material into a laser-dissected intrastromal pocket. We performed the study on ex-vivo porcine eyes. The increase of the refractive power was evaluated by optical coherence tomography (OCT). For a circular pocket, injection of 1 μl filler material increased the refractive power by +4.5 diopters. An astigmatism correction is possible when ellipsoidal intrastromal pockets are created. Injection of 2 μl filler material into an ellipsoidal pocket increased the refractive power by +10.9  dpt on the short and +5.1  dpt on the long axis. OCT will enable to monitor the refractive change during filler injection and is thus a promising technique for real-time dosimetry.

Original languageEnglish
Article number058001
JournalJournal of Biomedical Optics
Issue number5
Pages (from-to)1-7
Number of pages7
Publication statusPublished - 23.05.2019

Research Areas and Centers

  • Academic Focus: Biomedical Engineering


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