Results 181 to 190 of about 10,303 (219)
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A Device for Keratometry in the Supine Patient
Archives of Ophthalmology, 1986We fabricated a device that allows suspension of a keratometer from an operating microscope stand in a manner that permits keratometry to be performed with the patient in the supine position. The specifications for this device are given to allow replication by a hospital machinist.
J J, Kearney, C W, Van Sice
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Clinical and Experimental Optometry, 1987
A Humphrey Auto Keratometer was used to evaluate the changes in corneal astigmatism that occurred under hypnosis. The measurements were made at the visual axis and the corneal apex in eight subjects. These measurements were taken before, during and after hypnosis.
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A Humphrey Auto Keratometer was used to evaluate the changes in corneal astigmatism that occurred under hypnosis. The measurements were made at the visual axis and the corneal apex in eight subjects. These measurements were taken before, during and after hypnosis.
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Automated keratometry at low cost
IEEE Engineering in Medicine and Biology Magazine, 2000Describes an automatic optical system that is attached to a slit lamp in order to provide automatic keratometry at low cost. The system consists of projecting a light ring as a target onto the patient's cornea as well as analysis of the deformation of the target in order to obtain the radius of curvature and the axis of the associated astigmatism.
L, Ventura +3 more
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Applied Optical Principles: Keratometry
Ophthalmology, 1979The optical correction of the aphakic eye requires the addition of a significant amount of vergence power to the corneal interface by one of three modalities: spectacle, contact lens, or intraocular lens. No matter which modality is chosen, based upon Gullstrand's parameters, the corneal interface provides approximately 74% of the effective vergence ...
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Ophthalmic & physiological optics : the journal of the British College of Ophthalmic Opticians (Optometrists), 1996
During conventional keratometry, the two principal meridia are identified and measurements of the anterior corneal curvature determined along these orientations. However, in cases of corneal irregularity, the principal meridia may be difficult to identify. Accordingly, the present study sought to evaluate two alternative procedures which do not require
M, Rosenfield, J K, Portello
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During conventional keratometry, the two principal meridia are identified and measurements of the anterior corneal curvature determined along these orientations. However, in cases of corneal irregularity, the principal meridia may be difficult to identify. Accordingly, the present study sought to evaluate two alternative procedures which do not require
M, Rosenfield, J K, Portello
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The CLAO journal : official publication of the Contact Lens Association of Ophthalmologists, Inc, 1990
Corneal curvature was evaluated in 70 children by central keratometric measurements. The mean keratometric reading in each age group was seen to decline systematically from birth to about 54 months of age. The mean in the newborn-to-6-month-old group was 47.59 D; in the 12-18-month-old group it had decreased to 45.56 D.
P A, Asbell +3 more
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Corneal curvature was evaluated in 70 children by central keratometric measurements. The mean keratometric reading in each age group was seen to decline systematically from birth to about 54 months of age. The mean in the newborn-to-6-month-old group was 47.59 D; in the 12-18-month-old group it had decreased to 45.56 D.
P A, Asbell +3 more
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Refractive Outcomes Using Simulated Keratometry Versus Keratometry From an Optical Biometer
American Journal of OphthalmologyTo compare refractive prediction accuracy using simulated keratometry (SimK) measurements obtained from a Scheimpflug tomographer (Pentacam AXL, Oculus) versus keratometry (K) measurements obtained from an optical biometer utilizing telecentric keratometry (IOLMaster 700 (IOLM700), Carl Zeiss Meditec AG) applied to modern IOL power calculation formulas.
David L. Cooke +3 more
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Surgical Computerized Keratometry
Journal of Cataract and Refractive Surgery, 2000NARDI, MARCO, Pellegrini G, Azzarelli L.
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