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Results for “Refractometry”

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PubMed1984

Assessment and prediction of visual acuity in 3- to 4-year-old children born prior to term.

Previous studies of school-age children born prior to term indicate that they often have visual acuity that is slightly poorer than normal. However, visual acuity results for preschool-age preterm children have not been reported. In this study, we used the operant preferential looking procedure to measure the visual acuities of 23 3- to 4-year-old preterm children. The results indicated that, although many of the children had acuities within the normal range, the average acuity of the preterm children was slightly poorer than that of full-term children of the same age, even when children with significant refractive errors were eliminated from the sample. Neither birthweight, gestational age at birth, nor the presence of respiratory distress syndrome during infancy were predictive of later visual acuity. However, preferential looking acuity screening at 4 months corrected age did have some predictive value, in that 3 of the 4 infants who failed to complete testing at 4 months showed poor performance at 3 to 4 years of age.

Birth Weight↗
PubMed1983

The formula frenzie.

Explore the source record for details and available documents.

Aphakia, Postcataract↗
PubMed1983

Spherical aberration of the lens of the ground squirrel (Spermophilis tridecemlineatus).

Spherical aberration of the excised ground squirrel lens was measured by photographing the variation in back vertex distance for parallel helium - neon laser beams of various separations. The results indicate high levels of negative spherical aberration in amounts similar to that measured earlier for the rat lens. The effect of the aberration on resolution ability is likely minimized by the small size of the ground squirrel pupil in diurnal conditions and possibly by the existence of positive corneal aberration.

Animals↗
PubMed1984

The replacement of the chair, stand and phoropter by subjective autorefraction--a candid evaluation.

With all the competition from outside of professional optometry, it is imperative that the doctor of optometry offer the patient a service that is superior. Keep in mind that I am no better than or different from other doctors, but my patients see me that way. That is an important ingredient in a successful practice. My experience demonstrates that the Humphrey Over-refraction System can function with great efficiency as the primary and indeed the only subjective refraction device in a busy solo practice. It can also take a mediocre practice and help to put it on the map. Some may not have confidence in automation. Others may feel that the methods described herein are maverick or financially risky. If you are skeptical, whatever the reason, you will obviously stick with traditional refractive methods. If, on the other hand, you are dissatisfied with traditional methods and the fruits of your labor, automation is a solid alternative as long as sound management guidelines are followed.

Computers↗
PubMedDate not supplied

[Estimation of the size of bilayer liposome by optical density and refractive index].

A simple method for estimating a mean particles size in a suspension is suggested on the basis of an empirical correlation of a liposome size found by the optical shift method and on optic properties of the suspension. For liposome size characteristics only two parameters: optical density and refraction index increment are measured.

Biophysical Phenomena↗