ABSTRACT
Character of vision in 105 children with strabismus (with regular eye position) was tested using four dot test on different distance (5.0, 2.5, 1.0 m) and "Phorbis" device comprising phoropter and a set of light filters, that let us perform examination in the conditions of colour, polaroid and bitmapped division of visual fields. Stereoscopic vision was examined using original method based on anaglyph haploscopy. Binocular vision in strabismus was found to become more frequent as the distance and dissociating effect of light-filters decrease, and turned to be maximal in near testing in conditions of bitmapped haploscopy. Visual stereoscopic acuity in children with concomitant strabismus even on reaching regular eye position and binocular vision is significantly lower compared with healthy children of the same age.
Subject(s)
Esotropia/physiopathology , Exotropia/physiopathology , Vision Tests/instrumentation , Vision, Binocular , Child , Child, Preschool , Female , Humans , MaleABSTRACT
A modified procedure for diploid treatment is proposed to disinhibit a functional scotoma and to develop binocular vision (BV) in children with squint. The procedure is to examine a special test object through rotary prisms and polaroid filters inserted into a modernized spectacle frame. During treatment there is an opportunity of simultaneously changing the color of the test object and the position of its image on the retina. The study enrolled children in whom previous traditional methods for BV recovery had failed. Treatment using the proposed procedure could recover bifoveal fusion in 88.3% of cases (as evidenced by synoptophore examination) and BY in 73.3% (as shown by scanning haploscopy).
Subject(s)
Strabismus/therapy , Vision, Binocular , Child , Child, Preschool , Female , Humans , Male , Strabismus/physiopathologyABSTRACT
The paper describes the principle of developing a stereoscopic illusion test based on color anaglyphs. The test demonstrated on a monitor screen contains images of anaglyphic figures that are uniform in size and shape. Illusion is that, by defining the arrangement of the figures from their distance, an observer perceives them uniform. A possible mechanism for this illusion emergence is briefly considered.
Subject(s)
Optical Illusions , Vision Tests/methods , Depth Perception , Form Perception , HumansABSTRACT
A method is proposed to study stereoscopic visual acuity (SVA) by means of the test objects designed by the computer program Adobe Photoshop CS 2 (version 9, 2005). Each test object contains 3-4 silhouette figures made on the principle of color anaglyphs with varying degrees of transverse disparity. The capacity of an examinee of correctly showing on the display screen the sequence of the layout for the figures in depth with a minimal disparity determines its SVA. The authors propose to consider a disparity of 30 seconds of angle as a unit of SVA. The results of SVA examination using the proposed method (when the same object is demonstrated) do not depend on the site of figures on the screen and on the distance between the examinee and the monitor.
Subject(s)
Depth Perception/physiology , Vision Tests/methods , Visual Acuity/physiology , Child , Humans , Reproducibility of Results , SoftwareABSTRACT
A new method of color division of the visual fields based on polarized light interference is described. A new method for diploptic therapy of strabismus is developed, based on the above principle and possessing numerous advantages. The method was used in 38 patients with binocular disorders of various severity; binocular function improved in 18. The method is particularly effective in the patients with correct position of the eyes with bifoveal fusion on the synaptophore and parallel color test vision and in the patients with binocular vision and amblyobinopia.
Subject(s)
Color , Photic Stimulation/methods , Strabismus/therapy , Visual Fields , Child , Child, Preschool , Color Perception/physiology , Color Perception Tests , Female , Follow-Up Studies , Humans , Male , Strabismus/diagnosis , Strabismus/physiopathology , Treatment Outcome , Vision, Binocular/physiology , Visual AcuityABSTRACT
A method for treating amblyopia by using dynamic color objects (stimuli) influencing simultaneously different channels of the optic system is proposed. Original equipment based on polarized light interference was used, as well as a nomogram permitting rapid assessment of the optimal size of the offered test objects. The method was used in 90 children (99 amblyopic eyes). It reliably improved the efficacy of comprehensive treatment of amblyopia of different degree and origin and may be effectively used as the only method, particularly advisable for cases poorly treated by the traditional methods. The method is simple and interesting for young children.
