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Query: UMLS:C0018681 (headache)
 56,091 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

In a series of experiments, proofreading performance was consistently better with positive polarity (dark text on light background) than with negative polarity displays (light text on dark background). This positive polarity advantage was independent of ambient lighting (darkness vs. typical office illumination) and of chromaticity (black and white vs. blue and yellow). A final experiment showed that colour contrast (red text on green background) could not compensate for a lack of luminance contrast. Physiological measures of effort and strain (breathing rate, heart rate, heart rate variability and skin conductance level) and self-reported mood, fatigue, arousal, eyestrain, headache, muscle strain and back pain did not vary as a function of any of the independent variables, suggesting that participants worked equally hard in all experimental conditions, so that the interpretation of the primary performance measure was unlikely to be contaminated by a performance-effort trade-off.
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PMID:Text - background polarity affects performance irrespective of ambient illumination and colour contrast. 1751 Aug 22

The authors had tried to collect the data available on the Internet about a subject that we consider as being totally ignored in the Romanian scientific literature and unexpectedly insufficiently treated in the specialized ophthalmologic literature. Known in the specialty literature under the generic name of "Computer vision syndrome", it is defined by the American Optometric Association as a complex of eye and vision problems related to the activities which stress the near vision and which are experienced in relation, or during, the use of the computer. During the consultations we hear frequent complaints of eye-strain - asthenopia, headaches, blurred distance and/or near vision, dry and irritated eyes, slow refocusing, neck and backache, photophobia, sensation of diplopia, light sensitivity, and double vision, but because of the lack of information, we overlooked them too easily, without going thoroughly into the real motives. In most of the developed countries, there are recommendations issued by renowned medical associations with regard to the definition, the diagnosis, and the methods for the prevention, treatment and periodical control of the symptoms found in computer users, in conjunction with an extremely detailed ergonomic legislation. We found out that these problems incite a much too low interest in our country. We would like to rouse the interest of our ophthalmologist colleagues in the understanding and the recognition of these symptoms and in their treatment, or at least their improvement, through specialized measures or through the cooperation with our specialist occupational medicine colleagues.
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PMID:[Ophthalmologist and "computer vision syndrome"]. 1806 65

Today, millions of children use computers on a daily basis. Extensive viewing of the computer screen can lead to eye discomfort, fatigue, blurred vision and headaches, dry eyes and other symptoms of eyestrain. These symptoms may be caused by poor lighting, glare, an improper work station set-up, vision problems of which the person was not previously aware, or a combination of these factors. Children can experience many of the same symptoms related to computer use as adults. However, some unique aspects of how children use computers may make them more susceptible than adults to the development of these problems. In this study, the most common eye symptoms related to computer use in childhood, the possible causes and ways to avoid them are reviewed.
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PMID:Impact of computer use on children's vision. 2001 Oct 87

This study aimed to investigate the subjective health complaints (SHC) in the teaching profession of Hong Kong. On the basis of the SHC inventory, a questionnaire was prepared for data collection through a mail survey. A total of 1710 usable questionnaires were returned by the primary or secondary school teachers. The results showed that 99.5% (n = 1702) of respondents suffered at least one type of the 39 single health problems on the total SHC scale during the preceding 30 days. The 10 most frequently reported health complaints among the teachers were tiredness, eyestrain, anxiety, sleep problems, voice disorder, shoulder pain, neck pain, headache, cold/flu, and lower-back pain. With the exception of the category of pseudoneurological complaints, primary school teachers showed a statistically higher prevalence in reporting problems in 6 of 7 subscales. The 5 most severe complaints were tiredness, eyestrain, sleep problems, shoulder pain, and voice disorder.
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PMID:Subjective health complaints of teachers from primary and secondary schools in Hong Kong. 2033 16

Headache is a common presenting complaint in most family physicians' practices. Anxiety and depression (the ache of living) are at the root of most cases. A significant minority suffer from vascular headaches and a few cases harbor organic lesions.Headaches due to eyestrain, sinusitis, trigeminal neuralgia and hypertension are greatly overdiagnosed. The precise diagnosis of all cases of headache is important in choosing the appropriate therapy. Often the greatest benefit achieved is the discontinuation of inappropriate and potentially harmful treatment or self-medication.
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PMID:Headache as a presenting symptom. 2046 75

Working children of gem-polishing units are exposed to poor illumination and improper workstations. Also processes require lot of visual and mental concentration for precision. This may result in eyestrain. The study included 432 exposed and 569 comparison group subjects. Self-reported eyestrain was recorded through personal interview. Eyestrain included symptoms like itching, burning, or irritated eyes; tired or heavy eyes; difficulty seeing clearly (including blurred or double vision); and headache. The study variables included age, gender, daily working hours, and duration of exposure. The prevalence of eyestrain in child labourers was 32.2%, which was significantly more than the comparison group subjects. Also, the working children of gem-polishing units were at 1.4 times higher risk of developing eyestrain. Age (3)14 years and female gender were significantly associated with the eyestrain. The prevalence of eyestrain in child labourers was 32.2% and was associated with age (3)14 years and female gender.
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PMID:Asthenopia (eyestrain) in working children of gem-polishing industries. 2094 Feb 66

Computer vision syndrome (CVS) is the combination of eye and vision problems associated with the use of computers. In modern western society the use of computers for both vocational and avocational activities is almost universal. However, CVS may have a significant impact not only on visual comfort but also occupational productivity since between 64% and 90% of computer users experience visual symptoms which may include eyestrain, headaches, ocular discomfort, dry eye, diplopia and blurred vision either at near or when looking into the distance after prolonged computer use. This paper reviews the principal ocular causes for this condition, namely oculomotor anomalies and dry eye. Accommodation and vergence responses to electronic screens appear to be similar to those found when viewing printed materials, whereas the prevalence of dry eye symptoms is greater during computer operation. The latter is probably due to a decrease in blink rate and blink amplitude, as well as increased corneal exposure resulting from the monitor frequently being positioned in primary gaze. However, the efficacy of proposed treatments to reduce symptoms of CVS is unproven. A better understanding of the physiology underlying CVS is critical to allow more accurate diagnosis and treatment. This will enable practitioners to optimize visual comfort and efficiency during computer operation.
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PMID:Computer vision syndrome: a review of ocular causes and potential treatments. 2148 Sep 37

Patients frequently contact ophthalmologists because of headache or eye pain. Pure ophthalmological disorders are rarely causative (e.g. asthenopia or diseases of the outer eye). It is very important to recognize symptoms and signs of the causative general or neurological disorders.
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PMID:[Eye pain and headache from the perspective of an ophthalmologist]. 2203 8

The correction of astigmatism is an essential element for the refractive surgery because the majority of patients have important preoperative cylinder An uncorrected astigmatism decreases visual acuity and can also cause glare, asthenopia, headaches, monocular diplopia. It is important to remark that a complete elimination of astigmatism for the eye is very rarely achieved.
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PMID:[Essential features of astigmatism and its correction with excimer laser]. 2288 83

Visual stress is a condition characterised by symptoms of eyestrain, headaches and distortions of visual perception when reading text. The symptoms are frequently alleviated with spectral filters and precision tinted ophthalmic lenses. Visual stress is thought to arise due to cortical hyperexcitability and is associated with a range of neurological conditions. Cortical hyperexcitability is known to occur following stroke. The case presented describes visual stress symptoms resulting from stroke, subsequently managed with spectral filters and precision tinted ophthalmic lenses. The case also highlights that the spectral properties of the tint may need to be modified if the disease course alters.
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PMID:Visual stress symptoms secondary to stroke alleviated with spectral filters and precision tinted ophthalmic lenses: a case report. 2328 34


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