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PubMed1988

Dehydration of hydrogen contact lenses in vitro and in vivo.

An attempt was made to derive a model for predicting the extent of hydrogel lens dehydration in vivo (delta Wv) by using a contact lens refractometer to (1) measure the water content (W) of eight lenses ranging from 36.5 to 85.8% water before and after 90 min lens wear by six subjects; and (2) measure the rate of dehydration of the same lenses in vitro (delta Wt), in a controlled, randomized, double-masked experiment. A significant correlation was demonstrated between W and the rate of change of delta Wt (the dehydration rate, D), whereby lenses of higher water content dehydrate at a slower rate. No correlation was found between W and delta Wv or between D and delta Wv, thus precluding the development of a predictive model. Possible reasons for this failure, and directions for further research, are discussed.

Adult↗
PubMed1988

Laboratory evaluation of blended lenticular aphakic lenses.

Six types of blended lenticular aspheric lenses for the correction of aphakia were assessed with respect to mass, spectacle magnification, off-axis power errors, peripheral distortion, visual field size and cosmetic appearance. Relative to spherical surfaced lenses, these lenses showed considerably reduced mass, reduced peripheral distortion, increased visual field size and improved cosmetic appearance. All but one type showed considerably reduced off-axis power errors, but none of the lenses showed much reduction in spectacle magnification. In general, the manufacturers' claims made in favour of the blended lenticular lenses were supported.

Evaluation Studies as Topic↗
PubMedDate not supplied

[Refractive index and thickness of the outer layer of particles of dispersed perfluorochemical-based blood substitutes].

A calculation of the refractive index of particles of a disperse perfluorochemical-based (PFC-based) blood substitute has been made taking into account particular features of the structure of PFC emulsion particles and the equations earlier obtained by one of the authors in the studies on light interaction with optically inhomogeneous 2- and 3-layer spheres. The possibility of averaging by volume the refractive index of 2-layer emulsion particles has been shown. The refractive index of PFC particles has been experimentally determined using independent optical methods, and the thickness of the particle shell formed by a surfactant has been evaluated.

Blood Substitutes↗