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Results for “PRESBYOPIA”

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At least 793 records · Page 44Linked to original sources
PubMed1991

Sighting dominance and monovision distance binocular fusional ranges.

Clinicians typically apply the distance correction to the dominant sighting eye in fitting presbyopic patients with monovision (MV) contact lenses. We evaluated the effect of this fitting strategy on distance binocular fusional ranges for 23 presbyopic subjects. This sample was composed of successful and unsuccessful MV wearers. Fusional ranges for the two MV fitting possibilities (distance lens on the dominant eye, near lens on the dominant eye) were compared to fusional ranges in which both eyes were fitted with the distance correction. A greater esophoric shift and greater reduction in vergence ranges were demonstrated when the non-dominant eye received the clear image compared to when the dominant eye received the clear image. Successful MV patients demonstrated these effects to a lesser degree than did unsuccessful patients. In general, effects of MV on distance binocular fusional ranges were fewer when successful MV subjects received the clear image in the dominant eye.

Contact Lenses↗
PubMed1991

Patient response to concentric bifocal contact lenses.

We evaluated the visual results and success rate with a center-near concentric simultaneous vision bifocal contact lens. Forty subjects (screened from 175 presbyopic applicants) entered the study and were fitted with the CIBA Spectrum bifocal lenses (BCL) and also with single vision distance contact lenses combined with reading glasses (DCL). Visual acuity and stereoacuity measurements were made at dispensing and after 8 weeks of regular bifocal contact lens wear. At both times, visual acuity measurements with BCL were significantly reduced by 1-1.5 lines compared to DCL. Stereoacuity was reduced by 32-36" with BCL compared to DCL. Thirty-two patients completed the study and 27 chose to continue wearing BCL after completion of the study. None of the subjects had adverse corneal findings or problems of discomfort. The primary reason for BCL discontinuation was blurred vision. The data was retrospectively analyzed to identify risk factors for discontinuance--none were significant.

Adult↗
PubMed1991

Low vision aids and the presbyope.

When light rays emerge divergent from a low vision device, a presbyopic patient requires a near addition to focus the image. The magnitude of the divergence and the near addition power used by a presbyope can substantially alter the magnification effects of a device. This study examines the effects of different emerging divergences and near addition powers on the magnification of low vision devices. The emerging divergence of 54 fixed focus stand magnifiers was measured using trial lenses and a telescope. The magnifiers represented a range of powers and manufacturers. The emerging divergence was not predictable. It could not be correlated to magnifier power. Although mathematical formulas exist to calculate the effect of the divergence and near addition on magnification, tables were developed to simplify this determination.

Humans↗
PubMed1991

Clinical evaluation of the Tangent Streak trifocal contact lens.

The Tangent Streak trifocal is a rigid gas permeable contact lens with horizontal segments for distance, intermediate, and near correction. We undertook a prospective clinical evaluation of the Tangent Streak trifocal to determine the efficacy of this lens in correcting presbyopic symptoms. Distance, intermediate, and near corrections were compared using visual acuity and contrast sensitivity charts in 25 presbyopic ametropes. Compared to the original bifocal correction, the Tangent Streak trifocal provided 21 of 25 of study patients (84%) with subjectively improved intermediate vision, while maintaining distance and near vision. Twelve of 16 dissatisified bifocal contact lens wearers (75%) were successfully fit with the Tangent Streak trifocal. This study shows that the Tangent Streak trifocal lens can effectively provide multifocal vision to presbyopic ametropes.

Consumer Behavior↗
PubMed1990

Monovision.

Monovision has been a controversial contact lens correction modality for over 30 years. This paper addresses the major issues and concerns and considers them in the light of patient safety, visual efficiency and practitioner liability.

Adaptation, Ocular↗
PubMed1990

[The art of Toulouse-Lautrec and medicine].

After mentioning the numerous designs done by Henri Toulouse-Lautrec, in 1891, in Péan's surgical department, the author presents and explains a lithography published in 1897 in Georges Clemenceau's book "Au pied du Sinaï". The particular story it was to illustrate relates "how I became presbytic" ("Comment je devins presbyte") and shows the ophthalmologist Mayer prescribing reading glasses to Clemenceau.

Eyeglasses↗
PubMed1990

Informed consent for presbyopic contact lens patients.

The doctrine of informed consent requires that health care practitioners provide each patient with sufficient information about a proposed treatment so that the patient can make a knowing, willing and intelligent decision about the recommended treatment. The need for a thorough, well documented informed consent is especially important when prescribing monovision or bifocal contact lenses for presbyopic patients because of the relatively low success rate and possible associated vision compromise. Patients should be advised of the alternatives available and provided with a supplemental or alternative correction which will optimize the patient's vision for driving and other potentially hazardous activities. An example of an informed consent document that could be used to record the warnings and advice given to presbyopic contact lens patients is included. Failure to obtain the patient's informed consent and properly document it can be a major source of liability in contact lens practice. Use of informed consent documents such as the one described in this paper can minimize this possibility.

Contact Lenses↗
PubMed1990

Investigation of progressive addition lens patient tolerance to dispensing anomalies.

Numerous reasons have been cited for patient non-tolerance to Progressive Addition Lenses (PALs). This paper considers two presbyopic subject populations - those who successfully wore PALs (n = 20), and those who were non-tolerant to them (n = 18). The dispensing accuracy of the PALs worn by subjects was assessed and the surface quality of those lenses worn by unsuccessful patients studied. These factors do not account for any significant differences between the two groups, suggesting that other causes must separate the subject populations.

Adult↗
PubMed1989

The ageing eye.

Most of the problems which occur due to aging of the eye present first to the GP. It is important to make an accurate diagnosis so that appropriate reassurance, treatment or referral can ensue.

Aging↗
PubMed1989

Rembrandt.

Explore the source record for details and available documents.

History, 17th Century↗
PubMed1989

Clinical comparison of the TruVision Omni and four progressive addition lenses.

The TruVision Omni is a progressive addition lens (PAL) using a bipolar design and the Dirichlet principle to minimize optical aberrations. The design was evaluated by having each patient elect to keep one lens type after masked paired comparison of the TruVision Omni with one of four other PAL types: VIP, Varilux, New Super NoLine, and Gradal HS. The Omni was chosen most frequently in each case: 16 to 8, 17 to 6, 18 to 6, and 15 to 3, respectively. Thirty-seven percent reported that no adaptation was required with the Omni compared to 20% for the paired PAL. In terms of specific performances, Omni tended to rank highest for intermediate distance functions and freedom from distortion, average for distance functions, and slightly above average for near function. The data support the merit of Omni's design strategy.

Adult↗
PubMed1989

Clinical experience with the Tangent Streak RGP bifocal contact lens.

Eighty-one screened presbyopic subjects were fitted with the Tangent Streak Bifocal (TSB) rigid gas permeable contact lens. Sixty subjects received lenses, and of this group, 42 (70%) have worn the lens successfully for 6 months or longer. Failures mainly resulted from discomfort and occasionally, reduced visual quality. Successful subjects were particularly pleased with their crisp vision at distance and near. The TSB may be the lens of choice for those presbyopic patients who require high definition visual quality at distance and near.

Adult↗
PubMed1989

Investigation of the Alges bifocal.

A prospective study was undertaken to evaluate the success rate in fitting the Alges bifocal contact lens, and to determine which subject characteristics were associated with success. Fifty-eight presbyopic subjects with healthy eyes were included in the study. Thirteen subjects (22.4%) were screened out and discontinued after the fitting examination because of visual problems. Lenses were dispensed to 45 subjects (the dispensed group). Thirteen of these subjects were discontinued. Thirty-two subjects (71.1%) were considered successful after wearing their optimum lenses for 1 month. The successful group was interviewed by telephone after 3 months of wear. Two of these subjects were actually a "qualified" success. After 9 months, the successful group was again interviewed by telephone. Twenty-four subjects of the dispensed group were still considered to be optimally successful, five subjects were considered to be a "qualified" success and three subjects had discontinued lens wear. Our success rate for screened patients after 9 months was 64.4%. Two subject characteristics that were associated with success were a previous history of contact lens wear (p = 0.0065) and a near-point stereoacuity better than 100 s of arc with the Alges lens (p = 0.01).

Adult↗