Binocular Vision and the Modem Treatment of Squint

Dobson, Margaret

doi:10.1097/00007611-193310000-00031

Cited by 4 publications

(1 citation statement)

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“…4, 5, and 6, the mean improvement in the 6/60 minus group was much more marked than among the subjects with better than 6/60 vision. The average improvement for the former group was 0 48 log unit (equivalent to 4 8 lines on the Bailey-Lovie chart) for patients treated with either rotating gratings or the grey disc, while in the 6/60 plus group the average improvement was only 0 17 log unit (1 7 lines) for subjects treated with gratings and 014 log unit (14 Clinical trial of tde use of rotatin1g grating patterns in the treatment of amblyopia Further analysis of the data from the group of patients with better than 6/60 vision revealed no obvious difference in the degree of improvement among children that had received previous occlusion therapy and those that had received no prior treatment. There was also no observable difference in the response to treatment between children from either group with different forms of amblyopia (strabismic, anisometropic, etc.).…”

Section: Methodsmentioning

confidence: 93%

Clinical trial of the use of rotating grating patterns in the treatment of amblyopia.

Keith¹,

Howell²,

Mitchell³

et al. 1980

British Journal of Ophthalmology

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SUMMARY Recent reports suggest that the vision in amblyopia can be significantly improved by brief weekly periods of occlusion of the good eye while the child performs concentrated visuomotor tasks against a background of rotating gratings. We have conducted a controlled trial to investigate the role played by the gratings in this procedure. One group (n=33) of amblyopic children viewed a series of rotating gratings during treatment, while the other group (n=27) performed exactly the same visuomotor tasks against a homogeneous grey background. Particular attention was placed on the choice of tests of visual acuity in order to highlight the crowding phenomenon that is a characteristic feature of the visual loss in amblyopia. The chart selected for this purpose was the Bailey-Lovie chart in which the number of letters on each line was held constant and the letter sizes and spacing were graded in equal logarithmic steps. Some improvement in vision occurred in almost all patients in either treatment group, a finding that provides support for recent claims for the effectiveness of minimal occlusion therapy. The difference between the improvement in vision of the 2 groups, averaged across all tests, was not statistically different. On only 1 of 6 acuity scores was a statistically significant difference observed in favour of the grating treatment group. However, this was observed only on patients with better than 6/60 vision where the overall improvement was itself very small. There was no detectable difference between the 2 groups either in the rate of improvement of vision or in the tendency of the vision to be maintained or even improved after cessation of treatment. Since the patients treated with gratings improved little or no more than those in the control group, we conclude that most of the visual recovery was promoted by some other aspect(s) of the procedure.The last few years has seen a revival of interest in the use of brief or minimal periods of occlusion for the treatment of amblyopia.1-3 A particularly promising variant on this procedure which resulted in a dramatic improvement in the visual acuity of the amblyopic eye was reported by Banks et al. 4 The technique required occlusion of the nonamblyopic eye once a week for only 7 minutes, during which time the child viewed a series of rotating squarewave gratings of different periods or sizes that were located immediately behind a clear plastic plate on which the child drew or played games in order to maintain fixation on the gratings. Although this procedure involved only a slight alteration to the existing practice at Addenbrooke's Hospital, Cam-bridge, of having the child perform concentrated

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Section: Methodsmentioning

confidence: 93%