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XIIIth Congress of the IOA (International Orthoptic Association)

Binarimeter and Stereometer: Universal Methods to Eliminate Esotropia and Train Binocular Vision

Rabichev  Igor1, Vrubliauskas  Mecislovas2.

1 Center of Investigation and Vision Correction 'Perception', Moscow, Russian Federation.  The department of anatomy and physiology of humans and animals, Moscow State Pedagogical University, Moscow, Russian Federation. 2VISUS-4D Center, Vilnius, Lithuania.

Purpose. Present elimination methods neither allow us to get rid of constant horizontal and vertical diplopia (esotropia) nor train fusion, binocular and stereo-vision effectively.

Methods. We have invented and created complementary methods and devices: binarimeter and stereometer-stereotrainer Visus-4D for forming and training binocular and stereo-vision.

Binarimeter has precise controlled mechanism to fuse dual binocular images. The distance between dual images can be changed within limits  2 – 12 cm and the distance between images and eyes of a trainee can be changed within limits 5 – 120 cm. In case of physiological doubling, training is happening step by step by conscious watching and fusing dual images in three-dimensional space without separating visual fields.

With the help of polarizers separating visual fields on the screen of a personal computer, stereotrainer Visus-4d allows effective of esotropia, formation and training of stereovision for its integral feedback between vision and coordinated movement of eyes and a hand. The parameters of the basic static and dynamic virtual objects in space and time are managed by software and the test objects – by a trainee. The software changes, records and displays the results of fusion and vision in virtual three-dimensional space with great precision and comfort.

Because of different approach and impact on the visual system, both methods complement each other which allow faster and more effective training of fusion, stereovision and visual acuity.

Results. Over the period of 1.8 year 128 preschool, school and adult age trainees participated in the research, each of them training for eight months on average. A set of exercises with both devices were used. By doing exercises, 20 trainees have succeeded in eliminating diplopia, forming and training fusion; 11 continue their training; the other 97 trainees were doing exercises to form and train stereovision. Out of them, 72 persons have fully trained depth and binocular perception as well as improved visual and stereo-visual acuity.

Three trainees eliminated strabismus, however, have not succeeded in gaining stereovision; 22 trainees continue training to improve stereo-visual acuity. The quantity of exercises depended on the sensorimotor integrity and psychophysiological state of a trainee and continued between 0.6 – 1.5 years by doing 30 – 60 training sessions with bin?rimeter and 25 – 80 with stereo-trainer. Each session lasted for 30 – 60 minutes.  The research shows that results of training do not depend on age, but are rather dependent on interaction and quality of sensorimotor components of binocular vision.

Conclusions. Joint usage of both bin?rimeter and stereometer-stereotrainer Visus-4D is very effective and enables us to eliminate esotropia, even its complex forms, train fusion, depth perception and stereovision as well as increase visual acuity.

Updated 2016-02-24


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