Subnormal Binocular Vision with Special Reference to Peripheral Fusion* by T. Keith Lyle and Jill Foley

نویسندگان

T. KEITH LYLE

JILL FOLEY

چکیده

IN some cases of unilateral convergent squint the vision of the squinting eye may be suppressed to such an extent that eventually the affected eye appears to be almost blind through suppression-amblyopia, and the patient appears to rely almost entirely on one eye. On the other hand, in the case of a freely alternating squint, the visual acuity of each eye may remain normal throughout life, the patient appearing to change fixation from one eye to the other (depending upon the position of the object of attention) and to suppress to a greater or less extent the central area of the field of vision of the eye which is not being employed for fixation. In certain cases of convergent squint, however, whether unilateral or alternating, if appropriate treatment is carried out, restoration of the full function of normal binocular vision occurs. In general, it is true to say that the later the onset of a squint and the sooner corrective treatment is undertaken the better the prognosis. In order to develop normal binocular function in a patient whose binocular reflexes are defective, it is generally held that the first step in the treatment of the squint is to ensure that the visual acuity of the two eyes is equal. Thus occlusion of the fixing eye may be necessary as a preliminary measure. It is however important to realize that equal visual acuity is by no means essential for the' enjoyment of binocular single vision if the binocular reflexes have undergone normal early development, as Cases 1 and 2 illustrate:

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