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At least 19 recordsLinked to original sources
PubMed1992

Asthenopia induced by computer-generated fusional vergence targets.

A questionnaire was used to evaluate asthenopia in 30 normal subjects (Ss). Then, each S experienced 3 min of continuous alternating convergent and divergent fusional vergence or a control condition which was identical to the experimental condition, but without any vergence demand, i.e., version. The stimulus was a computer-generated flat fusion red-blue anaglyph picture of a horse. The order of vergence and version conditions were randomized. Asthenopia measures and maximal fusional vergence ranges measures were repeated immediately after each condition. Results indicated a significantly higher rating of asthenopia after induced vergence than version. There were no differences in maximal fusional vergence ranges or recovery values after the two conditions. Correlations between pretreatment asthenopia scores and asthenopia scores after either induced vergence or version were also not significant. Post hoc analyses of Ss grouped as having either high or low asthenopia, according to baseline ratings, revealed no significant differences in vergence or version conditions. Alternative hypotheses for these results are presented.

Adult↗
PubMed1991

[Changes in the dark focus of accommodation in patients with asthenopia].

The authors studied tonic accommodation in cases of asthenopia. The subjects consisted of ten college students, aged 20 to 22 years old as normal control and seven patients with asthenopia, aged 20 to 27. The dark focus of accommodation was measured with the infrared optometer before and after a 15 min sustained visual task. No significant differences were found between the two groups on the pre-task dark focus of accommodation. After the task, significant differences were found between the pre- and post-task dark focus of accommodation in patients with asthenopia. The results suggest that the patients with asthenopia are more susceptible to autonomic nervous system imbalance than healthy persons.

Accommodation, Ocular↗
PubMed1979

Visual evoked potential in patients with cerebral asthenopia.

Cerebral asthenopia is often overlooked as a symptom in diffuse brain lesion. An objective correlate of this symptom has so far never been demonstrated. Averaged visual evoked potential (VEP) in 10 patients with asthenopia was compared with 20 normal subjects. Both eyes and each eye alone were stimulated using bipolar recording in the midline and over each of the occipital lobes. There was no difference of latency of the VEPs in the two groups, but the amplitude of the most prominent component was significantly reduced in the patients. There was also a difference in the two groups regarding habituation and lateralisation. No amplitude difference could be found in the somatosensory evoked potential. The amplitude difference in VEP, as an objective correlate of asthenopia, is probably modal specific and suggests involvement of the visual cortex. VEP is unsuitable as a diagnostic tool due to the great overlap between amplitudes in asthenopic patients and control subjects.

Adult↗
PubMed1992

[Convergence insufficiency and asthenopia].

22 cases with convergence insufficiency (CI) were presented here. It is found that there was an important relationship between CI and asthenopia. The causes clinical findings, diagnostic criteria, treatment of CI and relation with asthenopia were discussed.

Adolescent↗
PubMed1990

[Asthenopia and monitor characteristics].

An epidemiological survey on 30,000VDT operators has been carried out to evaluate the relationship between asthenopia and monitor characteristics. A VDU operator has been classified as asthenopeic if he complained about at least two of the following ten symptoms: headache, tearing, eye smarting, blurred vision, double vision, ocular itching, photophobia, blinking, nausea, eye heaviness. Visual discomfort has been related to 1) the presence of flicker; the possibility to regulate, 2) brightness, 3) height; and 4) inclination of monitor. Asthenopia has resulted statistically correlated to the presence of flicker and to the impossibility of regulating height and inclination of monitor for both sexes. The possibility to regulate monitor brightness has not determined a reduction of visual discomfort either in men or in women.

Adult↗
PubMed1979

Restricted lees screen fields in patients with asthenopia, with and without psychogenic disorders.

Lees screen restrictions of non-specific origin, including apparent restrictions of the SR, IR, and LR muscles, were reported last year by Labow et al. In this complementary study, the authors examined eight apparently healthy subjects who had no history of ocular or psychiatric problems, eight psychiatric patients, and eight who had had a CNS disorder or had suffered cerebral trauma. Comparison of the Lees screen findings, visual fields, and accommodative defects of these patients revealed significant restriction of the Lees screen fields in only those patients who had symptoms of asthenopia (including all in the third group). Thus, such restriction does not depend on emotional state.

Adolescent↗
PubMed1989

[Asthenopia and objective ophthalmological findings in a population of 2058 VDT operators in Lombardy].

A large population of 2058 VDT operators from all compartments in Lombardia of a large national company was studied. An "ergophthalmological" questionnaire was administered to all subjects, followed by an ophthalmological-orthoptic examination. Ametropias showed a prevalence of 51.9%; the most common refractive defect was myopia followed by astigmatism and hyperopia. Heterophorias with bad or mediocre compensation had a prevalence of 4.1 and 11% respectively. The study of symptoms showed a frequency of 23.5% of intense asthenopic complaints and 21.1% of less severe and less frequent symptomatology. Asthenopia was significantly correlated (chi square) with sex, VDT exposure, refraction, presbyopia, and decompensated heterophorias.

Adult↗
PubMed1992

Asthenopia: frequency and objective findings.

Fifty young adults were interviewed about the asthenopic symptoms experienced in the preceding 6 months by means of a questionnaire; they then underwent ophthalmic investigation. We established the frequency of occurrence of single asthenopic symptoms and looked for their prevalence in subgroups determined by objective findings such as phorias, different accommodation widths, different fusional vergence widths, and others. The frequencies of single complaints were: headache 42/50 (84%), ocular pain 17/50 (34%), foreign body sensation 25/50 (50%), red eyes 22/50 (44%), photophobia 24/50 (48%), double vision 5/50 (10%), difficulties when changing fixation distance 21/50 (42%). We did not find any obvious preference for one of the symptoms in any of the subgroups mentioned above.

Adult↗
PubMed1989

[Scleroplasty as a prophylaxis against blindness and asthenopia in children with progressive myopia].

Remote results from 1.5 to 5 years, after sclera-enhancing operations on occasion of myopia in 51 children, of them 17 with congenital, 13--early acquired and 21--school myopia, have shown stabilization of school myopia in 88.9%, congenital--in 87% and early acquired--in 75% of cases; a rise of visual acuity in school and early acquired myopia is observed in a greater number of cases, than in congenital myopia. Scleroplasty is one of main methods to prevent blindness and poor vision in children with myopia.

Asthenopia↗