Search PubMed⌕ Search

SEARCH · Search PubMed

Results for “Vision Tests”

Search indexed PubMed citations on genomics, clinical trials, systematic reviews and public health. Explore titles, authors and supplied subject terms, then open the PubMed record.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

At least 1,369 records · Page 76Linked to original sources
PubMedDate not supplied

[Evaluation of the efficiency of the visual system in automobile drivers].

On the basis of results of the examinations performed in 545 persons one was aiming to establish the most frequently encountered abnormalities which are the cause of disqualifications in obtaining a professional or unprofessional driving licence. The licence obtained 386 persons and from that number 59.1 per cent professional and 40.9 unprofessional drivers. One hundred and fifty nine persons were refused a driving licence; 66.6 p.c. of this number were professional and 38.4 p.c. unprofessional drivers. The ground for disqualification referred to the presence of squint - 40.9 p.c., low visual acuity - 29.4 p.c., disturbances in color discrimination - 8.2 p.c., and three-dimensional vision - 4.4 p.c.

Adolescent↗
PubMedDate not supplied

[Evaluation of the visual system of ophthalmic specialists to assess suitability for the profession].

The author proposes a through ophthalmological examination and selection of the candidates for specialization in ophthalmology. He thinks that the ophthalmic surgeon should have a bilateral full visual acuity with an admittable correction of -1.0 D to +2.0 D, taking into consideration the physiological astigmatism, further--normal color discrimination, efficient adaptation and stereoscopic vision. Only such ophthalmic specialist is able to correctly evaluate the patients eye through the period of his professional activity.

Adolescent↗
PubMed1989

[Decrease of relative amplitude of evoked visual potentials caused by the use of a prism].

In search for an objective method of defining the quality of the binocular vision the author used the visual evoked potentials. The point was before all to estimate the added up records from both eyes checking up whether the amplitude of this record increases in dependence on the fact whether we apply the stimulus to one or to both eyes. A straight dependence between a binocular record from the whole retina and a record from the maculae cannot be discovered. By macular stimulation after placing a prism occurs a lowering of the relative amplitude connected with a disturbance of binocular vision and this enables the differentiation between the presence or lack of the stereoscopic vision in dependence on the fact wheather diplopia occurs or it does not.

Humans↗
PubMed1989

Vision care for the elderly: problems and directions.

This paper discusses vision care needs of the elderly population as a public health concern. Emphasis has been placed on the current utilization of optometric services. Recommendations are made for optometric practitioners to get actively involved as members of the multidisciplinary health care team, both by learning about aging and teaching other providers about vision of the aging, to truly serve the visual needs of the elderly.

Aged↗
PubMed1989

Adrenal and pituitary emergencies.

Although loss of normal pituitary function may be silent and asymptomatic, sudden loss of gland function (pituitary apoplexy) typically results in characteristic presentations. Sheehan's syndrome is the development of hypopituitarism after postpartum hemorrhage or shock. Patients with Sheehan's syndrome may have typical or atypical presentations based on the extent of pituitary gland destruction. Patients with typical symptoms fail to lactate after giving birth; subsequently these patients also develop symptoms and signs of hypopituitarism. Measuring the serum prolactin level after giving thyrotropin-releasing hormone is a reasonable first step in the diagnosis of this condition in patients who fail to lactate after giving birth. The diagnosis of hypopituitarism is delayed for up to 7 years in patients with atypical symptoms. Acute symptomatic failure of the pituitary gland (pituitary apoplexy) commonly occurs in patients who have asymptomatic pituitary tumors. Many patients with pituitary tumors do not have signs of abnormal endocrine gland secretion and have a normal appearance. Most patients have the following signs or symptoms: headache; acute disturbances in visual acuity or visual fields; ophthalmoplegia, and changes in the level of consciousness. The syndrome of pituitary apoplexy usually evolves over hours to days. Subarachnoid hemorrhage and acute bacterial meningitis are the two most important mimics of pituitary apoplexy. Intravenous steroids and prompt neurosurgical consultation are mandatory in cases of pituitary apoplexy since both steroids and surgery can improve vision. Testings for acute or chronic hypopituitarism is challenging in the Emergency Department setting; however, carefully chosen tests will aid in the subsequent early correct diagnosis after initial Emergency Department management.

Adrenal Gland Neoplasms↗
PubMed1989

Vision.

Explore the source record for details and available documents.

Cataract↗
PubMed1989

Visual perception and learning: issues and answers.

The role of the optometrist in treating children who are identified as learning disabled is not always understood by members of an interdisciplinary team. It is the purpose of this paper to develop a brief philosophical foundation for optometric intervention and to review some of the literature which supports the validity of optometric therapy. Correlational studies are cited to establish a basic relationship between perceptual dysfunctions and learning readiness in normal children. After establishing that perceptual training does indeed improve perceptual skills, we cite a number of investigations where intervention enabled children who had been classified as learning disabled to respond more effectively to school learning. The role of the optometrist as a member of an interdisciplinary team is addressed.

Humans↗
PubMed1989

Predictors of functional success in telescopic spectacle use by low vision patients.

Telescopic spectacles can theoretically improve function of low vision patients by enlarging retinal images. However, unintended head movement may produce sufficient instability of enlarged retinal images to negate the visual benefit. We investigated this phenomenon as a cause of failure in 38 low vision patients who had previously attempted use of telescopic spectacles. Patients underwent evaluation of the vestibulo-ocular reflex, visual-vestibulo-ocular reflex, head stability in the pitch and yaw axes, and sensitivity of magnified visual acuity to head motion. Although it was impossible to distinguish successful from unsuccessful telescopic spectacle users by means of clinical or historical data, multiple logistic regression analysis was used to derive a useful predictive function based on measurements of sensitivity of magnified vision to head motion, and head instability in the pitch axis. Predictive performance was found to be superior to conventional clinical judgement. These findings support the hypothesis that retinal image stability is important to functional vision, and suggest that head-stabilizing strategies may improve function with telescopic spectacles in certain low vision patients.

Adult↗
PubMed1979

Visual evoked potential (VEP): basic concepts and clinical applications.

The Visual Evoked Potential is the objective measurement of visual function monitored at the level of the occipital cortex with scalp electrodes. This article summarizes many of the recent clinical applications of the VEP. Included are basic concepts of the VEP and its clinical utilization for the objective assessment of refractive error, visual acuity, amblyopia, binocularity, demyelinating diseases, psychogenic disorders, pre-surgical prediction of post-surgical visual function, visual fields, color blindness and neurological development.

Amblyopia↗
PubMed1988

[Early evaluation of the vision of infants: baby vision, a reality today].

Non invasive techniques such as preferential looking, Teller acuity cards and orthoptic examination allow an early detection and treatment of visual defect. As early as 3 months of age, the pediatrician should refer to an ophthalmologist any child at risk on the ground of its personal or family history. Visual evoked potentials and retinography should be used in the case of more severe problems.

Electronystagmography↗