A new optical treatment for oscillopsia.

Rushton, D. N.; Cox, Neil D.

doi:10.1136/jnnp.50.4.411

Cited by 28 publications

(15 citation statements)

References 9 publications

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“…Rushton and Cox described an optical system that stabilizes images upon the retina 5 . This system consists of a highpositive-power spectacle lens worn in combination with a high-negative-power contact lens.…”

Section: Optical and Electronic Methods For Negating The Visual Consementioning

confidence: 99%

Medical Treatment of Nystagmus and Its Visual Consequences

2002

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Section: Optical and Electronic Methods For Negating The Visual Consementioning

confidence: 99%

Medical Treatment of Nystagmus and Its Visual Consequences

2002

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“…One approach consists of using high-plus spectacle lenses in combination with high-minus contact lenses (92). The underlying principle is that stabilization of images on the retina can be achieved if the power of the spectacle lens focuses the primary image close to the center of rotation of the eye.…”

Section: Optical Treatmentsmentioning

confidence: 99%

Therapy for Nystagmus

Thurtell

Leigh

2010

Journal of Neuro-Ophthalmology

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Pathological forms of nystagmus and their visual consequences can be treated using pharmacological, optical, and surgical approaches. Acquired periodic alternating nystagmus improves following treatment with baclofen, and downbeat nystagmus may improve following treatment with aminopyridines. Gabapentin and memantine are helpful in reducing acquired pendular nystagmus due to multiple sclerosis. Ocular oscillations in oculopalatal tremor may also improve following treatment with memantine or gabapentin. The infantile nystagmus syndrome (INS) may have only a minor impact on vision if "foveation periods" are well developed, but symptomatic patients may benefit from treatment with gabapentin, memantine, or base-out prisms to induce convergence. Several surgical therapies are also reported to improve INS, but selection of the optimal treatment depends on careful evaluation of visual acuity and nystagmus intensity in various gaze positions. Electro-optical devices are a promising and novel approach for treating the visual consequences of acquired forms of nystagmus.

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“…This consisted of a A28 diopter soft contact lens worn in combination with a spectacle lens (14±17 diopters, depending on each subject's refractive state) (Rushton and Cox 1987;Yaniglos and Leigh 1992). Subjects wore the contact lens on the eye not wearing the search coil.…”

Section: Subjects and Experimental Equipmentmentioning

confidence: 99%

Tests of a linear model of visual-vestibular interaction using the technique of parameter estimation

Das

DiScenna

Feltz

et al. 1998

Biological Cybernetics

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The goal of this study was to test whether a superposition model of smooth-pursuit and vestibuloocular reflex (VOR) eye movements could account for the stability of gaze that subjects show as they view a stationary target, during head rotations at frequencies that correspond to natural movements. Horizontal smooth-pursuit and the VOR were tested using sinusoidal stimuli with frequencies in the range 1.0-3.5 Hz. During head rotation, subjects viewed a stationary target either directly or through an optical device that required eye movements to be approximately twice the amplitude of head movements in order to maintain foveal vision of the target. The gain of compensatory eye movements during viewing through the optical device was generally greater than during direct viewing or during attempted fixation of the remembered target location in darkness. This suggests that visual factors influence the response, even at high frequencies of head rotation. During viewing through the optical device, the gain of compensatory eye movements declined as a function of the frequency of head rotation (P < 0.001) but, at any particular frequency, there was no correlation with peak head velocity 9P > 0.23), peak head acceleration (P > 0.22) or retinal slip speed (P > 0.22). The optimal values of parameters of smooth-pursuit and VOR components of a simple superposition model were estimated in the frequency domain, using the measured responses during head rotation, as each subject viewed the stationary target through the optical device. We then compared the model's prediction of smooth-pursuit gain and phase, at each frequency, with values obtained experimentally. Each subject's pursuit showed lower gain and greater phase lag than the model predicted. Smooth-pursuit performance did not improve significantly if the moving target was a 10 deg x 10 deg Amsler grid, or if sinusoidal oscillation of the target was superimposed on ramp motion. Further, subjects were still able to modulate the gain of compensatory eye movements during pseudo-random head perturbations, making improved predictor performance during visual-vestibular interactions unlikely. We conclude that the increase in gain of eye movements that compensate for head rotations when subjects view, rather than imagine, a stationary target cannot be adequately explained by superposition of VOR and smooth-pursuit signals. Instead, vision may affect VOR performance by determining the context of the behavior.

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A new optical treatment for oscillopsia.

Cited by 28 publications

References 9 publications

Medical Treatment of Nystagmus and Its Visual Consequences

Medical Treatment of Nystagmus and Its Visual Consequences

Therapy for Nystagmus

Tests of a linear model of visual-vestibular interaction using the technique of parameter estimation

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