Optical cylinder designs to increase the field of vision in the osteo-odonto-keratoprosthesis

Hull, Christopher C.; Liu, Christopher S.C.; Sciscio, Andrea; Eleftheriadis, Haralabos; Herold, J

doi:10.1007/s004170000191

Cited by 20 publications

(12 citation statements)

References 6 publications

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“…Previous it has been shown that the Italian cylinder has a maximum theoretical visual field of 76 o and further modifications can increase this to a maximum of 90 o . 10 Increasing the diameter of the cylinder will help to improve the visual field but this is limited by the diameter of the available root of the tooth. However, if the cylinder diameter is too large then visual function may be affected by glare.…”

Section: Discussionmentioning

confidence: 99%

Optical Functional Performance of the Osteo-Odonto-Keratoprosthesis

Lee

Ong

Lam

et al. 2014

Cornea

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This is the accepted version of the paper.This version of the publication may differ from the final published version. Results: Optical analysis showed that the optical cylinder is near diffraction-limited. A reduction in median visual acuity (logMAR) with increasing glare settings was observed from 0.04 (without glare) to 0.20 (with glare at 'High' setting) and significantly reduced statistically when compared to the control group at all levels of glare (P < 0.05). Contrast sensitivity was significantly reduced when compared to age-matched controls at medium and high spatial frequencies (P < 0.05). Median Goldmann perimetry was 65 o (interquartile range 64 -74 o , V4e isopters) and 69 o excluding two glaucomatous subjects. Several vision-related VFQ-25 sub-scales correlated significantly with visual acuity at various BAT levels and contrast sensitivity at medium spatial frequencies, including Dependency, General Vision, Near and Distance Activities. Permanent repository link Conclusions:The OOKP optical cylinder provides patients with a good level of visual acuity that is significantly reduced by glare. We have shown in vivo that updates to the optical cylinder design have improved the patient's field of view. Reduction of glare and refinement of cylinder alignment methods may further improve visual function and patient satisfaction.4

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Section: Discussionmentioning

confidence: 99%

Optical Functional Performance of the Osteo-Odonto-Keratoprosthesis

Lee

Ong

Lam

et al. 2014

Cornea

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“…Two-piece designs based on an inverted telephoto principle gave theoretical field angles over 120°. Aspheric surfaces were shown to improve the off-axis image quality while maintaining a potential visual acuity of at least 6/6 [6].…”

Section: Discussionmentioning

confidence: 99%

“…It uses the patient's own tooth and alveolar bone to support an optical cylinder. The two major drawbacks of OOKP are the complexity of the surgery and the narrow field of vision [6].…”

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confidence: 99%

Fyodorov–Zuev keratoprosthesis implantation: long-term results in patients with multiple failed corneal grafts

Ghaffariyeh

Honarpisheh

Karkhaneh

et al. 2010

Graefes Arch Clin Exp Ophthalmol

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“…5,6,10 However, as technology moves forward, new-generation 2-piece keratoprostheses may also offer the advantages of improved biointegration, ability to measure intraocular pressure, reduced retroprosthetic membrane formation, and increased visual field. [27][28][29][30][31][32] The FDA has recently approved the AlphaCor intracorneal keratoprosthesis for marketing in the United States. Multicenter clinical trials have been in progress for more than 3 years in Australia and Southeast Asia with outcomes reported in 45 patients.…”

Section: Discussionmentioning

confidence: 99%