Refractive Asymmetry in the Temporal and Nasal Halves of the Visual Fiel

Abstract

This paper is a further study of the refraction in the peripheral field of vision. Objective methods by means of a Zeiss refractionometer were employed. Three types of eyes in regard to peripheral refraction were noted. Type A, in which the eye becomes more myopic in the horizontal plane toward the periphery and more hyperopic in the vertical plane, and type B, in which myopia decreases in the horizontal plane, and hyperopia increases in the vertical plane as the periphery is approached have been discussed in a previous article. The present report concerns type C, in which a considerable difference was found between the nasal and temporal halves of the field. From the Research Laboratory of Physiological Optics, Wilmer Ophthalmological institute, Johns Hopkins Medical School. The Wilmer institute. This paper is a further study of the refraction in the peripheral field of vision. Objective methods by means of a Zeiss refractionometer were employed. Three types of eyes in regard to peripheral refraction were noted. Type A, in which the eye becomes more myopic in the horizontal plane toward the periphery and more hyperopic in the vertical plane, and type B, in which myopia decreases in the horizontal plane, and hyperopia increases in the vertical plane as the periphery is approached have been discussed in a previous article. The present report concerns type C, in which a considerable difference was found between the nasal and temporal halves of the field. From the Research Laboratory of Physiological Optics, Wilmer Ophthalmological institute, Johns Hopkins Medical School. The Wilmer institute.