eyestrain


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eyestrain

fatigue or irritation of the eyes, resulting from excessive use, as from prolonged reading of small print, or uncorrected defects of vision

Eyestrain

 

or asthenopia, a state characterized by a feeling of heaviness in the eyes, a dull pain in the forehead and temples (sometimes expressed as a headache), difficulty in working, diffuseness and indistinctness of previously distinct contours of objects (for example, letters in a text), and a need to close the eyes and rest them.

There are two types of eyestrain: accommodative and muscular. Accommodative eyestrain (overstrain of the accommodation muscle) develops primarily in young people suffering from hyperopia when there is need to study an object at close range for a long time. To avoid eyestrain the hyperopia must be corrected with eyeglasses, and the person must take periodic breaks from work and look into the distance. Analogous phenomena of eyestrain may be observed with uncorrected astigmatism of the eye.

Muscular eyestrain develops predominantly with uncorrected myopia and is caused by a relative weakness of the interior straight muscles of the eye, which effect convergence of the visual lines of both eyes on an observed object; upon closing one eye, all unpleasant sensations disappear. To pre-vent this form of eyestrain the myopia must be corrected, sometimes with the use of prismatic glasses (spheroprismatic lenses), and the person must take periodic breaks from work.

M. L. KRASNOV

References in periodicals archive ?
Apply the 20/20/20 rule, and look 20 feet away for 20 seconds every 20 minutes to help reduce the constant eyestrain associated with the close proximity of your computer monitor--and make an appointment to have your eyes checked if you haven't done so recently.
The technological and health benefits of the product allow for hours of enjoyment with family and friends without any worry of eyestrain and fatigue
In general practice we tend to ignore the symptom of eyestrain if the patient is an emmetrope; this study highlights that there are several other causes which should be investigated before labeling a patient as a malingerer.
Individualize for comfortable reading Change the Font * Veranda is recommended Increase screen resolution & * The better the resolution the clearer the image * The larger the font size the easier to see Adjust contrast and * Not too bright and not too dim brightness Clean your screen * Keep free of fingerprints and dust Place document holders * Place at eye level Eyestrain Internal Symptoms (accommodative External Symptoms (dry eye, stress, convergence stress, or glare, up gaze, small font, uncorrected refractive error) flicker, or environmental factors) * Aches or pain felt inside the eye * Burning * Headache * Ocular dryness * Diplopia (double vision) * Irritation or tearing * Blurring * Strain
Although discomfort and aching are commonly attributed to eyestrain, more often the cause is a headache due to a tension or fatigue of the muscles around the eyes as a result of frowning or squinting.
It is only if there are large, prolonged effects that people experience eyestrain.
Over time, this effort adds up, leading to blurry vision, eyestrain or headaches.
Summary: LG Electronics (LG), a leading provider of business solutions, announced the launch of its new W53 SMART Monitor Series with cutting-edge SMART technologies that offer top picture quality while greatly reducing eyestrain during extended use.
LG Electronics (LG), a leading provider of business solutions, has launched its new monitor series with latest technologies that offer top picture quality while greatly reducing eyestrain during extended use, said a report.
The typeface, however, is very small and sustained reading may require a magnifier to avoid eyestrain in more mature readers.
Seoul, Apr 6, 2009 - (ACN Newswire) - LG Electronics (LG), a leading provider of business solutions, today announced the launch of its new W53 SMART Monitor Series with cutting-edge SMART technologies that offer top picture quality while greatly reducing eyestrain during extended use.
Eyestrain can be experienced as burning, watering, blurring, headaches and fatigue.