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Sutureless contact lens ring system during vitrectomy.

Yasushi Ikuno·Masahito Ohji·Shunji Kusaka·Fumi Gomi·Kou Nakata·Hideyuki Futamura·Yasuo Tano
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Abstract

PURPOSE: To report a new sutureless ring system to fix corneal contact lens in place during vitrectomy. DESIGN: New surgical instrument. METHODS: The sutureless ring system consists of a stainless steel ring that has two upright tabs 180 degrees apart with a hook on the top and two elastic silicone bands 8 mm in diameter to fix the ring to the eyelid speculum. RESULTS: The contact lens fixed in place with the sutureless ring was stable and allowed intraoperative visualization of the fundus. CONCLUSION: This suture-free contact lens system facilitates visualization of the fundus during vitrectomy allowing shorter surgical time. It also enables us to avoid additional trauma associated with the lens ring fixation procedure.

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Contact LensesEquipment DesignHumansSuture TechniquesVitrectomyJournal Article

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Yasushi Ikuno, Masahito Ohji, Shunji Kusaka, Fumi Gomi, Kou Nakata, Hideyuki Futamura, Yasuo Tano. 2002. Sutureless contact lens ring system during vitrectomy.. https://doi.org/10.1016/s0002-9394(02)01409-5

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BACKGROUND: Models of oxygen delivery to the cornea with contact lens wear have considered the customary situation of one lens being worn on the cornea. However, two lenses, such as a rigid lens piggybacked on a soft lens, may be worn by patients with special ocular and visual needs. This paper extends existing single lens models to circumstances where two lenses offer resistance to oxygen in series. METHODS: Theoretical oxygen tensions are calculated for tear layers trapped beneath piggyback contact lens systems (and scleral lenses) and the anterior corneal surface with a simple single chamber corneal model using a personal computer software spreadsheet. RESULTS: Acceptable values are anticipated for contact lens materials of modern oxygen permeability values of approximately 60-100 Fatt Dk units under open eye conditions. CONCLUSIONS: The results of this spreadsheet model of oxygen supply to the anterior corneal surface offer a useful guide to clinicians concerned about providing their patients with physiologically acceptable piggyback lens systems.

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