Biomedical subjects

A E Belozerov

Publications and source records attributed to A E Belozerov.

5 recordsLinked to original sources

PubMedDate not supplied

[Clinical picture and treatment of diplopia].

A total of 203 patients with stable binocular diplopia were observed. Examinations included coordimetry, analysis of double images, and investigation of the doubling field in the gaze field. All examinations were performed using an original method with a serial computer. The treatment included therapy of the underlying disease, choice of correcting prisms, exercises aimed at extension of separate vision field, and operation on the oculomotor muscles. Three main forms of diplopia were distinguished: 1) muscular; 2) sensory; and 3) mixed. The first form includes diplopias in paresis of n.III and n.IV, n.VI, late development of convergent squint, orbital injuries, endocrine ophthalmopathy, and myasthenia. The second form includes diplopias developing after delayed operations for convergent squint, and the third form are diplopias after operations for detachment of the retina and implantation of intraocular lenses. The treatment led to complete neutralization of doubling in 18.7% cases, neutralization in the main part of the gaze field in 53.7%, the same with prism correction in 12.8% cases; in 14.8% patients adaptation to diplopia was attained after suppression of the second image. Diplopia in late squint is prognostically the most favorable, and the following conditions are listed in the order of more or less good prognosis: paresis of n.VI, n.IV, orbital injuries, endocrine ophthalmopathy, and artiphakia. The least favorable prognoses are for patients after delayed operation for squint and detachment of the retina. A new operation, plastic repair of the external m. rectus, was used in 96 patients with pareses of n.VI; no compensation was attained in only 2 patients.

Adolescent↗

PubMedDate not supplied

[Spatial contrast sensitivity in the differential diagnosis of optic neuritis].

Contrast sensitivity was examined in patients with optic neurites of different etiology. Achromatic and chromatic (red-black, green-black, and blue-black) sinusoidal patterns were presented in succession against the black background at a frequency of 1-22 cycles/degree on the monitor of an IBM computer. Contrast sensitivity was found altered during exacerbation of optic neuritis on both involved and intact eyes, this indicating a possible involvement of the chiasmal region. The authors discuss a new approach to investigation of the mechanisms of impairment of the optic nerve in optic neuritis in the presence of disseminated sclerosis and neuritis of obscure etiology.

Adolescent↗

PubMedDate not supplied

[A new method of assessing contrast sensitivity in patients with eye diseases].

A new method for examining spatial contrast sensitivity (SCS) is described, making use of the display of an IBM-compatible computer, on which sinusoidal patterns are presented: achromatic and chromatic red, green, blue against the black background at a frequency of 0.5 to 22 cycles/degree. In health similarity of curves to the achromatic and chromatic patterns was observed, with the maximal sensitivity at spatial frequencies from 2 to 8 cycles/degree and a reduction at low and high spatial frequencies. In patients with the initial open-angle glaucoma the SCS at the high spatial frequencies was reduced for all colors with "dips" at the medium spatial frequencies in response to the blue pattern. In patients with albinism the SCS to achromatic and chromatic patterns were appreciably decreased in the entire range of spatial frequencies and absent at all in the range of high spatial frequencies. The method is recommended for investigating the channels of achromatic and chromatic spatial sensitivity, detecting the contribution of color receptors to the color contrast, and for the initial diagnosis of diseases of the retina and optic nerve.

Albinism↗

PubMedDate not supplied

[A new method for accommodation training].

A new method for accommodation training making use of a computer is proposed. A specially generated dynamic grid of concentric rings serves the stimulus. Changes of the accommodation parameters (the nearest and farthest points of clear vision) were examined in 11 display users aged 30 to 50 during a training session and in the course of 15 sessions. The training improved the accommodation volume by an average of 0.9 diopters at the expense of approximating the nearest and withdrawing the farthest clear vision points. In 4 subjects anisoaccommodation disappeared almost completely. The proposed method may be used to normalize the accommodation of display users.

Accommodation, Ocular↗

PubMedDate not supplied

[Contrast sensitivity in amblyopia, abiotrophy and optic nerve atrophy in children].

The threshold spatial contrast sensitivity was assessed in children with amblyopia, tapetoretinal abiotrophy, and partial atrophy of the optic nerve of different origin. The measurements were carried out at spatial frequencies of 0.5-22 cycle/grad. Tests with white, red, green, and blue arrays against a black background realized in the Zebra software for IBM computers with VGA or SVGA displays were carried out. Classification of curves representing the contrast sensitivity for the above conditions is proposed. Characteristics of the groups with the above diseases are described, based on the height, shape, and mutual position of the curves.

Adolescent↗