ISSN:0093-7002    

出版商:OVID    

年代:1978

数据来源: OVID

摘要:

With double-masking procedures, the dose-response curves for 0.1, 0.2, and 0.4% benoxinate and 0.125, 0.25, and 0.50% proparacaine hydrochloride were determined by monitoring changes in corneal touch threshold after applying each anesthetic. The level of corneal anesthesia necessary for applanation tonometry was also determined. The maximum increase in threshold that could be measured following instillation of 50 μl of the drug was 200 mg/mm2 All 6 anesthetic solutions produced this amount of decreased corneal sensitivity. Recovery from the anesthetic was exponential for all concentrations; however, the lower doses had the shortest duration. For applanation tonometry, the corneal threshold for touch must be 75 mg/mm2 or higher. We conclude that a quarter to a half of the commonly used anesthetic dose is sufficient for routine tonometric evaluation.

ISSN:0093-7002    

出版商:OVID    

年代:1978

数据来源: OVID

摘要:

We fitted each of 20 eyes with 3 different Hydrocurve(tm) contact lenses: (1) spherical with prism ballast, (2) back-toric without prism ballast, and (3) back-toric with prism ballast. We monitored the stability of the lenses. The prism-ballast lenses were generally stable on corneas with zero to 3.5 DK of with-the-rule toricity; the back-toric nonprism lenses were not stable.

ISSN:0093-7002    

出版商:OVID    

年代:1978

数据来源: OVID

摘要:

The author reviews the previous known effects of UV radiation on the eye together with results obtained on human and animal eyes in his laboratory during the past 11 years. Damage to the cornea and lens is assessed, classified, and discussed. Methods of calculating safe UV exposures and establishing characteristics of protective devices are presented.

ISSN:0093-7002    

出版商:OVID    

年代:1978

数据来源: OVID

摘要:

A retrospective study of the first 225 intraocular lens implants (IOL) performed by a single surgeon was conducted for this report. In complication rate and visual acuity assessed 4.5 months postoperatively, these patients (pseudophakes) compared very closely with 2 populations of aphakic patients who had had phacoemulsification surgery without lens implantation by the same surgeon. The majority of pseudophakes were left with moderate to low refractive errors. Patient satisfaction was found to be high. It appears that implantation of iris and capsular fixated intraocular lenses is a comparatively safe and in many cases advantageous procedure.

ISSN:0093-7002    

出版商:OVID    

年代:1978

数据来源: OVID

摘要:

The water flow conductivity of 3 high-water-content (70 to 85%) gel materials proposed for extended-wear contact lenses was measured. Pore diameter was calculated from these flow conductivities. High-water-content gels were found to have pore diameters in the range of 20 to 30 A compared with about 8 A for the lower-water-content HEMA gel. The larger pore diameter of extended-wear lenses will permit entry of drugs, hormones, and enzymes and thereby may pose new problems for wearers.

ISSN:0093-7002    

出版商:OVID    

年代:1978

数据来源: OVID

摘要:

High-Lite S-1005 lenses (Schott Optical Company) of various center thicknesses were tested for static load fracture resistance. Chemically tempered High-Lite lenses of 1.7-mm center thickness were found to be equivalent in strength to 3.0-mm heat-tempered crown lenses; 1.34-mm chemically tempered High-Lite lenses were equivalent in strength to 2.07-mm heat-tempered crown lenses. These findings agree closely with earlier data on chemically tempered crown glass and therefore illustrate that chemically hardened lenses can be made significantly thinner than Z-80 specifications and still meet FDA strength requirements.

ISSN:0093-7002    

出版商:OVID    

年代:1978

数据来源: OVID

摘要:

The New York City Medicaid program uses computerized monitoring techniques as part of its effort to control the quality and utilization of services. The system can identify certain aberrant patterns of practice. For optometric services, one such practice by some providers is the prescribing of separate distance and near eyeglasses in lieu of bifocals. Sending a notification letter to these providers succeeded in modifying the practice. Computerized monitoring and associated roles for professionals are discussed.

ISSN:0093-7002    

出版商:OVID    

年代:1978

数据来源: OVID

摘要:

This report describes a technique for recording the visual evoked potential (VEP) arising from 1 eye under conditions of binocular pattern stimulation. The subject views a sinusoidally modulated vectographic checkerboard with orthogonally oriented polarizing filters before the eyes. This technique results in waveforms that contain monocular VEPs distributed in time. The technique is sensitive to interocular suppression and controls for the influence of various extraneous sources of variability. It is useful in clinical VEP testing.

ISSN:0093-7002    

出版商:OVID    

年代:1978

数据来源: OVID

摘要:

A simple foot-operated shutter cable frees both hands for holding the gonioscope lens and adjusting the Nikon slit lamp during photography of the recess of the anterior-chamber angle.

ISSN:0093-7002    

出版商:OVID    

年代:1978

数据来源: OVID