A Simple Method for Widening Restricted Visual Fields

Holm, Olle

doi:10.1001/archopht.1970.00990040613010

Cited by 14 publications

(4 citation statements)

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“…An intriguing diversity of solutions has been developed including hand-and spectaclemounted reversed telescopes, door peephole viewers, behind the lens reversed telescopes, complex bioptic telescopes (where the distance telescope is mounted high above the visual axis like a reversed vocational bifocal) and combination contact lens-spectacle devices. [129][130][131][132][133][134][135][136] While strongly supported in literature, 131,132,136 there is little clinical use of the reversed telescope. 129,130,132,133,137 Why are reversed telescopes rejected by the patient?…”

Section: Visual Field Enhancementmentioning

confidence: 99%

Retinitis pigmentosa: visual function and multidisciplinary management

Herse

2005

Clinical and Experimental Optometry

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Retinitis pigmentosa (RP) is a leading cause of blindness and visual disability in younger people. Optometrists have a major role in detecting RP and in reducing the visual disability associated with RP. This review summarises the literature relating to visual function in people with RP, with particular attention given to night‐blindness, visual acuity decrease and visual field contraction. The range of low vision aids available for people with RP is reviewed and suggestions given on aids that have been found to be most successful. Most importantly, this review overviews the range of services available to people with RP and emphasises how optometrists need to work with a network of professionals to ensure the best possible visual outcomes for people with RP. Particular mention is made of current findings relating to orientation and mobility training, driving, sensory substitution and adaptive technology. The modern optometrist needs to be aware of the multiple needs of people with RP and have the ability to link them with the professionals best able to help them.

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Section: Visual Field Enhancementmentioning

confidence: 99%

Retinitis pigmentosa: visual function and multidisciplinary management

Herse

2005

Clinical and Experimental Optometry

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“…Technically, these minifying optical systems bring images from peripherally damaged visual field to the central less damaged field, which result in improved visual field. [20] This study showed that a reversed Galilean telescope caused a significant improvement in the visual field. All measured perimetric indices were significantly affected by the implemented reversed Galilean telescope.…”

Section: Discussionmentioning

confidence: 84%

The Effect of Contact Lens–spectacle Reversed Galilean Telescope on the Visual Field of Patients with Open-angle Glaucoma

Moniritilaki¹,

Badakhsh²,

Ehsaei³

et al. 2020

JOVR

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Purpose: Glaucoma causes irreversible visual field defects. This study aims to evaluate the effect of a reversed Galilean telescope on the visual field of patients with open-angle glaucoma. Methods: Fifty-two glaucoma patients with a restricted visual field were recruited for this study. Central 30° visual field measurements were performed using a Humphrey visual field analyzer before and after applying the reversed Galilean telescope. To be more cosmetically acceptable, a combination of contact lens–spectacle was used as the reversed Galilean telescope. Results: Our data analysis showed that the reversed Galilean telescope had a significant effect on all measured perimetric indices. Visual field index (VFI) improved from a basic value of 44.38 ± 26.96 percent to 49.30 ± 29.83 percent by using the reversed telescope (P < 0.001). Moreover, the mean deviation (MD) was significantly improved from the initial value of –19.91 ± 7.19 dB to a value of –18.69 ± 7.73 dB (P < 0.001). However, our results showed a significant reduction in the pattern standard deviation (PSD) comparing before (9.83 ± 2.82) and after (8.51 ± 3.30) values using the reversed Galilean telescope (P < 0.001). Conclusion: The contact lens–spectacle combination reversed Galilean telescope significantly improved the central 30° visual field of glaucoma patients with the restricted visual field.

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“…The effect of a narrow visual field on mobility has been known to clinicians and vision scientists for a long time, and several investigators have tried to expand the remaining visual field in RP and glaucoma patients by means of optical devices [19,20]. Hoeft et al reported immediate improvement in mobility in one-half of RP patients who used amorphic lenses for visual field expansion [21].…”

Section: Mobility and Visual Fieldmentioning

confidence: 99%

Toward a wide-field retinal prosthesis

et al. 2009

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The purpose of this article is to present a wide field electrode array that may increase the field of vision in patients implanted with a retinal prosthesis. Mobility is often impaired in patients with low vision, particularly in those with peripheral visual loss. Studies on low vision patients as well as simulation studies on normally sighted individuals have indicated a strong correlation between the visual field and mobility. In addition, it has been shown that increased visual field is associated with a significant improvement in visual acuity and object discrimination. Current electrode arrays implanted in animals or human vary in size; however, the retinal area covered by the electrodes has a maximum projected visual field of about 10°. We have designed wide field electrode arrays that could potentially provide a visual field of 34°, which may significantly improve the mobility. Tests performed on a mechanical eye model showed that it was possible to fix flexible polyimide dummy electrode arrays of 10 mm wide onto the retina using a single retinal tack. They also showed that the arrays could conform to the inner curvature of the eye. Surgeries on an enucleated porcine eye model demonstrated feasibility of implantation of 10 mm wide arrays through a 5 mm eye wall incision.

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A Simple Method for Widening Restricted Visual Fields

Cited by 14 publications

References 0 publications

Retinitis pigmentosa: visual function and multidisciplinary management

Retinitis pigmentosa: visual function and multidisciplinary management

The Effect of Contact Lens–spectacle Reversed Galilean Telescope on the Visual Field of Patients with Open-angle Glaucoma

Toward a wide-field retinal prosthesis

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