RESUMO
The acuity card procedure is an effective method for the assessment of grating acuity in preverbal and nonverbal patients. However, the effect of nystagmus on this acuity assessment has not been well-described. We studied the effect of grating orientation on the measurement of resolution acuity in a group of nystagmus patients, a group of patients with albinism and nystagmus, and a normal control group. The resolution acuity was significantly (P < or = .01) better with horizontal grating orientation in both the nystagmus and the albino groups, but grating orientation did not affect resolution acuity in the control group. This study suggests that grating orientation must be taken into account when using the acuity card procedure in patients with nystagmus.
Assuntos
Nistagmo Patológico/fisiopatologia , Testes Visuais/métodos , Acuidade Visual/fisiologia , Adulto , Albinismo/complicações , Albinismo/fisiopatologia , Humanos , Nistagmo Patológico/etiologia , Estudos Prospectivos , Reprodutibilidade dos TestesRESUMO
Unilateral extensive myelination of the peripapillary nerve fibers may be associated with anisometropic myopia, strabismus, and reduced vision. Despite aggressive occlusion of the normal eye, visual results are often disappointing, presumably due to associated structural abnormalities in the macula which limit visual potential. We report two cases, a 21-month-old child and a 23-month-old child with unilateral peripapillary myelination, ipsilateral high myopia, and dense amblyopia. Despite an abnormal macular reflex in each child, vision improved to 20/30 in one child and 20/50 in the other child after occlusion therapy. Visual results in these patients suggest that aggressive amblyopia therapy should be considered in patients with anisometropic amblyopia associated with extensive myelination continuous with the optic nerve. Not all patients with unilateral peripapillary myelinated nerve fibers, an abnormal macula, and myopia will have refractory amblyopia.
Assuntos
Ambliopia/terapia , Anisometropia/terapia , Doenças do Nervo Óptico/complicações , Ambliopia/complicações , Anisometropia/complicações , Óculos , Feminino , Fundo de Olho , Humanos , Lactente , Fibras Nervosas Mielinizadas , Prognóstico , Acuidade VisualRESUMO
The patient who notes binocular diplopia may indicate that horizontal, vertical, or cyclorotary components are present. Although the single binocular visual field provides an indication of the area which is free of horizontal and vertical diplopia, it does not assess cyclorotary diplopia. A simple modification of the single binocular visual field which allows determination of the clinical significance of the cyclorotary component of diplopia is presented. Reproducible information is easily obtained, assisting in patient follow-up and management.
