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

* this article represents a traditional method of the analysis and administration of binocular imaginative and prescient issues * it's a sensible, very glossy textual content with a hugely designed structure and with huge use of complete color illustrations * Containing contributions via appropriate specialists within the box it's conscientiously edited to make sure that a uniform and always excessive usual is maintained all through

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Binocular Vision & Orthoptics. Investigation and Management

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Example text

2 5 DS). They cannot relax to a normal near lag because any relaxation of accommodation results in loss of control of convergence. Exercises are the treatment of choice and are almost always successful (see Chapters 3 and 6). Indeed, if they are found not to be successful then careful review of the diagnosis is prudent, in particular a check on medial rectus function. Convergence excess esophoria Uncorrected hypermetropia and/or a high AC/A ratio can result in a decompensated esophoria at near (see Chapters 1-4).

G. Distance: orthophoria, Near (33cm):3~ exophoria. PD = 6cm 1 1 6cm PD The gradient test gives the lower value, perhaps because the large typeface of the numbers does not require full accommodation. Also, the real distance of the numbers is obvious, and this proximal cue conflicts with the visual stimulus created by change in the power of the lenses. 2). Clinically it is important to be able to designate the ACj A ratio as high or low; that is, whether a patient's accommodation has a major or minor effect on convergence.

Am. J. Optom.. 58(9). 746-52. North. R. V. and Henson. D. B. (1985). III 27 Adaptation to lens-induced heterophorias. Am. J. Optom. Physiol. Optics. 774-80. Revell. M. J. (1971). Strabismus: TheHistory of Orthoptic Techniques. pp. 234-5. Barrie Jenkins Ltd. Rutstein. R. P. and Fuhr, P. S. (1992). Efficacy and stability of amblyopia therapy. Optom. Vis. , 69(10). 747-54. Winn, B.. Gilmartin. B.. Sculfor, D. L. and Bamford. J. C. (1994). Vergence adaptation and senescence. Optom. Vis. Sci.. 71, 797-800.

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