摘要:

PurposePeople with central field loss tend to fixate so that information falls in the inferior or left visual field. Studies of reading from a page of text suggest that using inferior field is advantageous relative to using left visual field. In this study, we investigated whether reading without eye movements in normal peripheral vision is better when text is presented in inferior or left visual field.MethodsReading rates were determined for retinally stabilized rapid serial visual presentation sentences of seven letter sizes, presented at 5° in inferior and left visual field of six normal observers.ResultsWhen print size is appropriately magnified for peripheral viewing, reading speed in inferior field is faster than in left visual field. There is no significant difference between inferior and left visual field in the print size required to reach maximum reading speed.ConclusionsFor reading tasks not involving eye movements, there is an advantage in eccentrically fixating such that text falls in inferior rather than left visual field.

ISSN:1040-5488    

出版商:OVID    

年代:2000

数据来源: OVID

摘要:

The purpose of this study was to examine ocular symptoms that have been associated with dry eye among contact lens wearers. A dry eye questionnaire was administered at random to 83 contact lens wearers at a private practice in Toronto, Ontario. On average, the most frequent ocular symptom among those queried was dryness and the least frequent was soreness. There was a significant shift (p < 0.0001; paired t-test) toward increased symptoms in the evening compared with the morning. Blurry, changeable vision was also a frequent and noticeable symptom. However, most subjects reported that their ocular symptoms were not severe enough for them to stop work or hobbies or to remove their contact lenses. Our results show that the symptoms of ocular dryness and discomfort are relatively common among contact lens wearers, and that they worsen toward the end of the day. These findings suggest that lens care practitioners should examine their patients who wear contact lenses toward the end of the day to best identify symptomatic patients.

ISSN:1040-5488    

出版商:OVID    

年代:2000

数据来源: OVID

摘要:

In the present work, we use random-dot stereograms to test a possible relationship between associated phoria and stereopsis. We determined, using a modified constant-stimulus method, the disparity range that indicates the maximum range at which stereoscopic correspondence can be achieved. A total of 27 observers took part in the experiment. The value of the disparity range as a function of the associated phoria (measured with a Mallet unit) seems to indicate that greater associated phoria (fixation disparity) correlates with a deterioration in stereoscopic vision, reducing the disparity range and therefore the space region in which stereoscopic vision can be attained.

ISSN:1040-5488    

出版商:OVID    

年代:2000

数据来源: OVID

摘要:

PurposeTo test the hypothesis that access to and amount of eye care services in Jamaica are inadequate and that this is related to insufficient eye care personnel and legal limitations on optometric practice in Jamaica.MethodsAn eye care provider survey, a consumer survey, and a literature search were used for data collection. The consumer sample consisted of 500 subjects (aged 16 to 84 years or older) recruited from a stratified random sample of food markets in Jamaica. The provider sample consisted of 10 ophthalmologists and 10 optometrists, randomly selected from licensing rosters. Adequacy of amount of eye care services was measured by comparing the frequency of eye examinations in Jamaica with professional practice guidelines. Access was measured by the eye provider to population ratio compared with calculated need for adequate care.ResultsOnly 38.6% of the study population had received an eye examination within 3 years and only 23.4% reported having eye examinations at least once every 3 years. Over 43% had never received an eye examination. The total eye care provider/population ratio was only 2.04/100,000 and only 1.32/100,000 when optometrists are excluded.ConclusionAccess to and amount of eye care services are severely inadequate in Jamaica. Outdated optometric laws governing the activities of eye care professionals compounds the problem.

ISSN:1040-5488    

出版商:OVID    

年代:2000

数据来源: OVID

ISSN:1040-5488    

出版商:OVID    

年代:2000

数据来源: OVID