Retinal Image in Axial and Refractive Ametropia

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Retinal image in axial and refractive ametropia.

THERE are some features relative to the size of the retinal images in these two conditions which are of general interest, though they are rarely discussed. Axial Ametropia.-The " basic " (blurred) retinal image is smallest in hyperopia, intermediate in emmetropia, and largest in myopia. The size of a blurred retinal image is best taken from the points in the diffusion circles at the extremities...

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Distribution of axial, corneal, and combined ametropia in a refractive surgery unit.

PURPOSE To group eyes in our refractive surgery unit on the basis of the origin of their ametropia and to assess the percentage of eyes in the different groups. METHODS Refractive parameters and the axial eye length (AL) of 131 eyes of 131 persons with different refraction were measured. The eyes were initially classified into five groups on the basis of the grade of their ametropia: hypermet...

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Image defocus and altered retinal gene expression in chick: clues to the pathogenesis of ametropia.

PURPOSE Because of the retina's role in refractive development, this study was conducted to analyze the retinal transcriptome in chicks wearing a spectacle lens, a well-established means of inducing refractive errors, to identify gene expression alterations and to develop novel mechanistic hypotheses about refractive development. METHODS One-week-old white Leghorn chicks wore a unilateral spe...

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Ciliary muscle morphologic changes with accommodation and axial ametropia.

PURPOSE To use anterior segment optical coherence tomography (AS-OCT) to analyze ciliary muscle morphology and changes with accommodation and axial ametropia. METHODS Fifty prepresbyopic volunteers, aged 19 to 34 years were recruited. High-resolution images were acquired of nasal and temporal ciliary muscles in the relaxed state and at stimulus vergence levels of -4 and -8 D. Objective accomm...

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Influence of refractive error and axial length on retinal vessel geometric characteristics.

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ژورنال

عنوان ژورنال: British Journal of Ophthalmology

سال: 1955

ISSN: 0007-1161

DOI: 10.1136/bjo.39.6.380