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Download e-book for iPad: Binocular Vision & Orthoptics. Investigation and Management by Bruce J. W. Evans BSc PhD FCOptom DipCLP DipOrth FAAO

By Bruce J. W. Evans BSc PhD FCOptom DipCLP DipOrth FAAO FBCLA, Sandip Doshi PhD MCOptom

ISBN-10: 0750647132

ISBN-13: 9780750647137

* this article represents a standard method of the analysis and administration of binocular imaginative and prescient issues * it's a useful, very smooth textual content with a hugely designed format and with large use of complete color illustrations * Containing contributions by means of suitable specialists within the box it's carefully edited to make sure that a uniform and regularly excessive ordinary is maintained all through

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Additional info for Binocular Vision & Orthoptics. Investigation and Management

Sample text

Or more was taken as indicating a test fail for the Blurred vision Double vision Distorted vision Difficulty with stereopsis Monocular comfort Difficulty changing focus Headache Sore, tired, aching eyes General irritation. The symptoms can be broadly classified into three categories: visual perceptual distortions (1~3), binocular disturbances (4-6), and asthenopia (7-9). 1 Receiver-operatorcharacteristiccurve ( ROC) of aligningprism for detecting decompensated heterophoria, re-drawn with permission from Jenkinsei (/1.

1998). In the UK, where the Mallett unit is in widespread use. the diagnosis for most cases is relatively straightforward. Threequarters of cases who have a symptomatic heterophoria will have a significant aligning prism on the Mallett unit. Therefore if a patient has symptoms and an aligning prism on the Mallett unit, then it is very likely that the heterophoria requires treatment and more detailed testing may not be required. Although the sensitivity and specificity of the Mallett unit are good, they are not perfect and there will be cases where more detailed investigation is required consider.

1). Using this method, the normal values range from 4: 1 to 7: 1. Thegradientmethod of calculating the ACj A ratio is by determining the effect of spherical lenses on convergence. It can be measured either at distance or near. 1 Theprism cover test enables the ACjA ratio to becalculated(courtesy of]. Kanski) measured at distance, only minus lenses can be used; at near, plus or minus lenses can be used. The phoria (or tropia) is measured by the prism cover test or by Maddox rod, first without any additional lenses and then again with additional minus or plus lenses.

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Binocular Vision & Orthoptics. Investigation and Management by Bruce J. W. Evans BSc PhD FCOptom DipCLP DipOrth FAAO FBCLA, Sandip Doshi PhD MCOptom

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