Combining a Contact Lens and Wide-Angle Viewing System for a Wider Fundus View

Ohji, Masahito; Tada, Eijiroh; Futamura, Hideyuki

doi:10.1097/iae.0b013e31822a900b

Cited by 14 publications

(10 citation statements)

References 3 publications

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“…Chihara et al designed a prototype contact lens, with zero power, used in combination with a non-contact wide angle system and showed it not only prevented the cornea from becoming dry, but led to a smooth corneal surface, providing a good quality of view [59]. Some other studies assessed the simultaneous use of a magnifying contact lens and a non-contact WAVs: a wider field of view, along with no corneal dehydration and the potential ability to rapidly switch to a magnified macular view were observed [60, 61]. …”

Section: Wide-angle Viewing Systemsmentioning

confidence: 99%

Vitreoretinal instruments: vitrectomy cutters, endoillumination and wide-angle viewing systems

Oliveira¹,

Berger

Chow

2016

Int J Retin Vitr

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There have been many advances in vitreoretinal surgery since Machemer introduced the concept of pars plana vitrectomy, in 1971. Of particular interest are the changes in the vitrectomy cutters, their fluidics interaction, the wide-angle viewing systems and the evolution of endoillumination through the past decade and notably in the last few years. The indications of 27-gauge surgery have expanded, including more complex cases. Cut rates of up to 16,000 cuts per minute are already available. New probe designs and pump technology have allowed duty cycle performances of near 100% and improved flow control. The smaller vitrectomy diameter can be positioned between narrow spaces, allowing membrane dissection and serving as a multifunctional instrument. Enhanced endoillumination safety can be achieved by changing the light source, adding light filters, increasing the working distance and understanding the potential interactions between light and vital dyes commonly used to stain the retina. Wide-angle viewing systems (contact, non-contact or a combination of both) provide a panoramic view of the retina. Non-contact systems are assistant-independent, while contact systems may be associated with better image resolution. This review will cover some current aspects on vitrectomy procedures, mainly assessing vitrectomy cutters, as well as the importance of endoillumination and the use of wide-angle viewing systems.Electronic supplementary materialThe online version of this article (doi:10.1186/s40942-016-0052-9) contains supplementary material, which is available to authorized users.

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Section: Wide-angle Viewing Systemsmentioning

confidence: 99%

Vitreoretinal instruments: vitrectomy cutters, endoillumination and wide-angle viewing systems

Oliveira¹,

Berger

Chow

2016

Int J Retin Vitr

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“…A magnifying vitrectomy contact lens appears to be the most advantageous, as it can provide a wider fundus view 5,6. However, a lens holder or a fixation ring is necessary when using this procedure.…”

Section: Discussionmentioning

confidence: 99%

A new lens for observing fundus with a noncontact wide-angle viewing system

Kita¹,

Fujii²,

Hama³

2017

OPTH

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Drying of the cornea during surgery, which causes poor visibility of the fundus, is one of the most serious problems when using a noncontact-type wide-angle viewing system. This study used a newly commercialized lens for observing the fundus with a noncontact wide-angle viewing system. The lens used has a very thin meniscus made of polymethyl methacrylate and a large outer diameter. Following the application of viscoelastic material, the lens can be put on the cornea without using a contact lens fixation ring. The larger diameter and lightweight characteristics of the new lens contributed to the overall stabilization. The smooth surface of this lens was able to achieve an intraoperative view of good quality not only during vitrectomy but also during scleral buckling procedures.

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“…The vitrectomy contact lenses provided sufficiently clear vision for fine procedures, but the viewing angle was limited, while BSS, viscoelastic agent, and an RGP contact lens were better for peripheral shaving. Another prototype vitrectomy contact lens has the advantage of a wider fundus view 7. Disadvantages of the vitrectomy contact lenses included poor centering on the cornea because of its weight (therefore, it required suturing a lens ring to stabilize the lens position) and higher cost than the other materials.…”

Section: Discussionmentioning

confidence: 99%

Commercially available rigid gas-permeable contact lens for protecting the cornea from drying during vitrectomy with a wide viewing system

Kamei¹,

Matsumura²,

Sakaguchi³

et al. 2012

OPTH

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PurposeWe evaluated the usefulness of commercially available materials for protecting the cornea from drying during vitrectomy with a wide-angle viewing system.MethodsThree vitreoretinal surgeons evaluated fundus visibility during vitrectomy on the images of five study materials used on the cornea: balanced saline solution, a viscoelastic agent, a vitrectomy contact lens, a rigid gas permeable (RGP) contact lens, and a soft contact lens. Fundus visibility was graded using the following scale: grade 1, unclear; grade 2, slightly unclear; grade 3, clear; and grade 4, very clear.ResultsRespective scores for each material used during core vitrectomy and membrane removal were: balanced saline solution, 3.3/3.3; viscoelastic agent, 3.8/3.3; vitrectomy contact lens, 3.3/4.0; RGP contact lens, 4.0/3.9; soft contact lens, 1.1/not applicable.ConclusionThe RGP contact lens provided visibility similar to or clearer than that obtained with other methods. Because of its ease of use and lower cost, use of the RGP contact lens is ideal during vitrectomy performed with a wide-angle viewing system.

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Combining a Contact Lens and Wide-Angle Viewing System for a Wider Fundus View

Cited by 14 publications

References 3 publications

Vitreoretinal instruments: vitrectomy cutters, endoillumination and wide-angle viewing systems

Vitreoretinal instruments: vitrectomy cutters, endoillumination and wide-angle viewing systems

A new lens for observing fundus with a noncontact wide-angle viewing system

Commercially available rigid gas-permeable contact lens for protecting the cornea from drying during vitrectomy with a wide viewing system

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