摘要:

AbstractSwelling of the cornea during sleep when wearing an extended wear contact lens has an osmotic and hypoxic component. The normal swelling of the cornea during sleep, caused by the change from hypertonic tears of the open eye to the isotonic tears of the closed eye, is about 3%. Under an extended-wear contact lens, there is an additional 6 to 8% swelling of the cornea in the closed eye because the cornea under the contact lens is at an oxygen tension substantially below that present in the palpebral conjunctiva. Data on human subjects wearing extended wear contact lenses are consistent with this allocation of the 8 to 12% total corneal swelling observed upon awakening.

ISSN:0093-7002    

出版商:OVID    

年代:1981

数据来源: OVID

ISSN:0093-7002    

出版商:OVID    

年代:1981

数据来源: OVID

摘要:

AbstractThe clinical concept of the range of zero-associated phoria is developed, and normative data for this range are presented based on a clinical study of 201 asymptomatic patients. The relation of patient age, sex, and amount of near lens addition to this range is examined. The range at far is not related to patient age or sex. The range at near appears to be independent of patient age, sex, and the amount of near addition required by presbyopes.

ISSN:0093-7002    

出版商:OVID    

年代:1981

数据来源: OVID

摘要:

AbstractEmergent textural contours, the perceptual effect seen during continuous rotation of symmetrical arrays of uniform pattern elements, provide a unique source of visual feedback for eye movements and resolutional states and have potential for use as a new clinical tool. The phenomenon is produced by a combination of factors including the effects of visual persistence and differential resolution. A total of 28 subjects including 17 normals, 4 nystagmus, 4 oculomotor dysfunction, and 3 accommodative facility cases were shown an emergent textural contour with an instrument (the Goldrich Contour Rotator) for its display. Subjects were enabled to monitor their own eye movements and accommodative training. Nystagmus subjects were provided with a continuous source of visual input reflecting their ocular oscillations and a determination of the null point of nystagmus was made with the instrument.

ISSN:0093-7002    

出版商:OVID    

年代:1981

数据来源: OVID

摘要:

AbstractThe ability of moderate to intense aerobic exercise to reduce intraocular pressure (IOP) has been reported. Previous studies have focused on a single postexercise recovery period not considering the long-term effect of improved physical fitness on IOP. A total of 32 adult subjects, all having IOP's of >18 mm Hg in each eye as determined by an American Optical Corporation Non-Contact Tonometer, were selected for the study. After a complete medical and visual evaluation, participants were randomly assigned to either an intervention group (N = 18) receiving a 6-month supervised exercise program to improve physical fitness or into a control group (N = 14). After 6 months, each group was reevaluated to observe changes in physical fitness and IOP.Pre- and poststudy measurements of maximum oxygen uptake (ml/kg/min) made with a Beckman O2analyzer showed significant improvement in physical fitness in the intervention group (p < 0.05). There was a significant decrease (p < 0.05) in IOP, 2.0 mm Hg in the right eye and 1.3 mm Hg in the left eye, in the intervention group; however, decreases in IOP were comparable and significant (p < 0.05) in the control group. Results from multiple regression analysis for each individual group and for combined groups indicated that changes in IOP were not dependent upon changes in physical fitness.

ISSN:0093-7002    

出版商:OVID    

年代:1981

数据来源: OVID

摘要:

AbstractThe current modality for correcting unilateral aphakia is by the use of daily wear hard and soft contact lenses and by the use of intraocular lens implants. The use of the Cooper Permalens soft contact lens as an extended wear lens for correction of aphakia was investigated in 177 eyes. The relative merits of the extended wear lens are discussed with emphasis on fit, visual function, and contact lens-related problems.

ISSN:0093-7002    

出版商:OVID    

年代:1981

数据来源: OVID

摘要:

AbstractA form of postgraduate optometric education began in 1973 with the initiation of residency programs within two colleges of optometry. The availability of residency programs for optometrists, however, was essentially nonexistent until the Veterans Administration became actively involved. The first Veterans Administration Optometry Residency Program was established by the Kansas City Veterans Administration Medical Center and the Illinois College of Optometry. This paper briefly discusses the development and philosophy of this program and describes its clinical and academic content and future goals.

ISSN:0093-7002    

出版商:OVID    

年代:1981

数据来源: OVID

摘要:

AbstractAn Imsai 8080 microcomputer is being used to simultaneously generate a color graphics stimulus display and to record visual-evoked cortical potentials. A brief description of the hardware and software developed for this system is presented. Data storage and analysis techniques are also discussed.

ISSN:0093-7002    

出版商:OVID    

年代:1981

数据来源: OVID

摘要:

AbstractField losses are of particular significance to the low-vision patient, so it is incumbent upon the low-vision clinician to determine the degree, location, and extent of this field loss. Optometrists prefer to map the fields carefully for quantitative analysis, but if fatigue or debility prevent this a simplified technique is required. Devices and techniques are described which are shown to be effective.

ISSN:0093-7002    

出版商:OVID    

年代:1981

数据来源: OVID

摘要:

AbstractA patient who had ingested quinine as a suicide gesture was followed from 14.5 hr to 6 months with electrodiagnostic tests. The electroretinogram revealed early increased a-wave and decreased bwave amplitudes, increased implicit times, and diminished oscillatory potentials. The electro-oculogram showed a decreased “light rise,” and the pattern visually evoked potential was found to have an increased implicit time throughout the period of testing. These data indicate that there is an early direct toxic effect of quinine on the retinal cells.

ISSN:0093-7002    

出版商:OVID    

年代:1981

数据来源: OVID