PubMed Health⌕ Search

SEARCH · PubMed Health

Results for “PRESBYOPIA”

Explore indexed PubMed citations for clinical trials, systematic reviews and public health research. Read source abstracts and follow each citation to its original PubMed record.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

At least 883 records · Page 49Linked to original sources
PubMed1984

The effectiveness of multifocal correction upon presbyopic near and intermediate visual resolution performance.

The effectiveness of multifocal correction upon presbyopic near and intermediate visual resolution performance was measured using Landolt ring targets. Decimal resolution acuity was determined at eight viewing distances from 36.4 cm to 1 m for non-presbyopic controls, presbyopic subjects corrected for infinity, and for presbyopic subjects corrected by bifocals, trifocals and Varilux 2 multifocal lenses. Non-presbyopic subjects demonstrated a resolution ability of 1.9 decimal acuity or better at all viewing distances. Presbyopic subjects corrected for distance but without multifocal addition showed a precipitous decrease in visual acuity to less than .50 decimal acuity at distances closer than 58 cm. When corrected by conventional straight-top bifocal lenses, these individuals regained a maximum of 1.8 decimal acuity at 40 cm, but demonstrated a significant depression of intermediate visual acuity to about .90 between 44 and 58 cm. Correction with straight top trifocal lenses and Varilux 2 progressive addition lenses enabled presbyopic subjects to resolve acuity targets at the level of 1.6 decimal acuity at all test distances.

Adult↗
PubMed1978

Contact lenses for the graying American.

The 1960s were the time of civil rights, the 1970s emphasized women's rights. and the 1980s will embrance the rights of the aging. By then, the median age of the U.S. population will be over 30 and the fastest growing segment of the population will be the 24 or 44 year olds, who underpin the nation's economic growth. With fewer children and more working wives, contact lenses are affordable and attractive but these people are becoming presbyopic. Optometrists interested in contact lenses have liked to think of their patients as youthful so the graying of America will bring sweeping changes to the field. Mature patients deserve the improved vision and pleasure they can experience wearing contact lenses.

Adult↗
PubMed1984

Progressive addition lenses for deaf lip readers and signers.

Deaf patients depend on intermediate vision for interpersonal communication. Deaf presbyopes are at a particular disadvantage since they are usually corrected for near and far vision with bifocals without consideration of their intermediate vision. Progressive addition lenses were used in this study to provide an intermediate correction for a group of deaf presbyopes. The patients' communication ability was tested through Varilux II lenses and habitual bifocals on a series of standardized lip reading and sign language tests. The patients showed better visual communication skills with the progressive adds, a preference for the progressive adds, and the impression of better vision through the progressive addition lens as opposed to their habitual bifocals.

Aged↗
PubMed1980

Double masked study of progressive addition lenses.

Fifty-four patients, selected to encompass the full range of bifocal additions were involved in a double masked study of Varilux II and Ultravue progressive addition lenses in which neither patient in or examiner knew the type of lens prescribed at a given trial. Measurements of width of near field were taken with each type prior to and following wearing periods of one month each. Subjects had complete freedom to select or substitute a form of bifocal of their own choice without extra costs. The paper indicates the selections made, and considers the variables influencing these choices. The final results imply that acceptance of variable focus lenses may rest more with the bias of the practitioner than the readiness of the patient.

Adult↗
PubMed1982

Predictable visual responses to increasing age.

Some loss of visual efficiency with age is universal. Such visual impairment probably is more disabling than most young eye practitioners tend to realize because the visual loss that attends uncomplicated aging impacts only slightly the common clinical tests of vision. Nevertheless, visual impairment associated with aging can interfere significantly with one's ability to perform certain types of visual tasks efficiently. This becomes a problems particularly when these tasks must be carried out under less than optimal viewing conditions.

Accommodation, Ocular↗
PubMed1982

Monocular fitting: a viable alternative for the presbyope.

Monovision, the practice of using non-bifocal corrections by fitting one eye for distance and the other for near seeing, is neither occlusion nor is it a serious hinderance in judging distance for many, but it breaks with the traditional concepts of binocular seeing.

Adult↗
PubMed1982

Bifocal contact lenses.

A brief description of the construction and optical behavior of three general forms of hard contact lens bifocals are described. Each is considered from the standpoint of essential fitting criteria and brief techniques and qualifications affecting potential success are noted. The authors' technique utilized over many years of fitting segmented forms of contact lens bifocals is described in detail. Applications of principles affecting positioning and rotation of such lenses associated with edge design and lid action are noted. A simple clinical technique for determining appropriate segment height and position and viability of segment translation a priori to ordering contact lenses is described. Summarization indicates that common principles apply to all forms varied only by aspects of the individual constructions, and that these principles may also apply to the newly presented soft contact lens versions of bifocals.

Contact Lenses↗