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pmid: 4096210
Abstract. Both eyes of 40 normal persons were examined with a photokeratoscope. A method for analyzing the photokeratoscopic data based on the principle of least square fitting is presented. It is demonstrated that the corneal flattening expressed as the relative change in the radius of the corneal curvature is proportional with the square of the chord distances from apex. The factor of proportionality RV is defined as the coefficient of radius variation, which, together with the radius of the apex curvature K, are characteristic constants for a given meridian in a given eye. Expressed as mean and SD, the study demonstrates for the horizontal meridian K=7.86 mm (0.25) and RV=0.71 times 10‐2 mm‐2 (0.26 times 10‐2), for the vertical meridian the corresponding dimension are K=7.65 mm (0.24) and RV=0.70 times 10‐2 mm‐2 (0.38 times 10‐2). These results imply a change in the radius of the corneal curvature 1 mm and 5 mm from apex at, respectively, 0.7% and 17.7%. The precisions expressed as SD, by which the 2 parameters may be determined, are for K 0.03 mm and RV 0.12 times 10‐2 mm‐2.
Adult, Male, Models, Anatomic, Adolescent, Middle Aged, Cornea, Methods, Photography, Humans, Female, Aged
Adult, Male, Models, Anatomic, Adolescent, Middle Aged, Cornea, Methods, Photography, Humans, Female, Aged
citations This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically). | 35 | |
popularity This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network. | Average | |
influence This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically). | Top 10% | |
impulse This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network. | Top 10% |