Optometry and vision science : official publication of the American Academy of Optometry
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Comparative Study
Effect of contact lens wear and a near task on tear film break-up.
To study the effect of extrinsic controls on blinking by examining blink parameters and tear stability among adapted soft contact lens (CL) wearers performing tasks that require varying amounts of visual concentration. ⋯ During tasks requiring concentration, the IBI increased (blink rate decreased) and many blinks were incomplete without CLs. With CLs, tear film instability increased. Blinking frequency also increased, but it remained high when subjects played the game, and symptoms of ocular irritation increased. This suggests that wearing soft CLs, even when fully adapted, provides enough extrinsic ocular surface stimulation to override internal controls and affect blink parameters.
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Adaptive optics (AO) describes a set of tools to correct or control aberrations in any optical system. In the eye, AO allows for precise control of the ocular aberrations. If used to correct aberrations over a large pupil, for example, cellular level resolution in retinal images can be achieved. ⋯ In this article, I discuss the applications and advantages of using AO in a specific system, the AO scanning laser ophthalmoscope. Since the Borish award was, in part, awarded to me because of this effort, I felt it appropriate to select this as the topic for this article. Furthermore, users of AO scanning laser ophthalmoscope continue to appreciate the benefits of the technology, some of which were not anticipated at the time of development, and so it is time to revisit this topic and summarize them in a single article.
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To determine the prevalence of amblyopia, strabismus, and refractive errors in children entering school. ⋯ A considerable proportion of 6-year-old children have strabismus and/or significant, potentially amblyogenic refractive errors. The relatively high rate of hyperopia and astigmatism in the studied population needs more attention. The results of the study emphasize the need for adequate diagnostic and therapeutic eye care services for preschool children.
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This study investigates the relationship between blinking, tear film break-up, and ocular symptoms for normal and dry eye subjects performing four different visual tasks. ⋯ Reduced and incomplete blinking along with increased tear film break-up during normal visual tasks may explain the increased level of ocular discomfort symptoms reported at the end of the day, particularly in dry eye patients.
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Biography Historical Article
Barry Collin: a visionary for a new direction in optometry.