Muscle transplanation surgery is presently widely accepted as a good precedure not only for cosmetic, but also for functional results, a concept to which Marina's observations on the absence of fixed and predetermined functions in the nuclei and associated tracts of the oculomotor system give great support; however, not everyone is in agreement with this concept. This paper report one case in which the total transplantation of the vertical rectus muscles midway between their insertions and the insertion of the lateral rectus muscle were carried out, in addition recession of the medial rectus muscle and resection of the paralyzed lateral rectus muscle. Our case have been followed up during 8 months to rule out late complications, aspecially ocular movement and diplopia. No late complications, however, have been found up to remaining underaction of the right superior and inferior oblique muscles and also medial rectus muscle. The eyes were straight with abduction of the right eye up to 40 prism diopters. Binocular vision was present and there was no diplopia. The cosmetic result was excellent.
Diplopia ; Muscles ; Paralysis* ; Vision, Binocular

Aiming at the medical service robot used in the indoor environment, this study proposes a method to test the pose accuracy of its working surface based on the binocular vision system. This method uses a binocular vision coordinate system to measure targets fixed on the working surface of the service robot, aligns the measurement system with the robot base coordinate system through the nonlinear least squares method, and integrates the multi-eye image data to achieve the accuracy test of the working surface. Finally, the vision test program was tested and verified on a mobile service robot model ABIR X8. According to the accuracy index given in GB/T 38124 Service Robot Performance Test Method, the test results of its pose accuracy were obtained.
Optical Devices ; Robotics ; Vision, Binocular

To determine whether distance stereoacuity improved following strabismus surgery in patients with intermittent exotropia, we tested distance stereoacuity of 107 patients preoperatively and postoperatively using the Mentor B-VAT IIVideo Acuity Tester. Following successful surgical alignment there was significant improvement of postoperative distance stereoacuity in binocular vision contour circles[BVC]and binocular vision random dot E[BVRDE]test[p<0.05 ]. Based on BVC testing, performance improved 45.8%of the patients after surgery, remained unchanged in 43.0%, and decreased in 11.2%. Based on BVRDE testing, performance improved 29.9%of the patients after surgery, remained unchanged in 66.4%, and decreased in 3.7%. But improvement of postoperative distance stereoacuity was not related statistically to age, operative methods, suppression, and preoperative size of deviation. From the results of this study, it is concluded that the BVC test is a useful test for assessing control in intermittent exotropic patients. Distance stereoacuity improved after successful operation, thus distance stereoacuity test may be helpful in evaluation of preoperative and postoperative intermittent exotropia control.
Exotropia ; Humans ; Mentors ; Strabismus ; Vision, Binocular

PURPOSE: The purpose of this study was to evaluate, and compare the mean value of near and distance stereoacuity in normal and intermittent exotropia {(X)T}children. METHODS: This study included 86 children, 43 normal children and 43(X)T children ranging in age from 4 to 10 years. Near stereoacuity was assessed by Titmus circle and Randot circle tests. Distance stereoacuity was measured with the Random Dot and Circles tests on the Mentor B-VAT II videoacuity tester. The presence of fusion was examined by Worth 4-dot test(W4D). RESULTS: The mean value of near stereoacuity measured on Titmus and Randot was 45.6 and 29.1 seconds of arc(") respectively, in normal children, and 53.5 and 33.5" respectively, in(X)T children. The mean value of distance stereoacuity measured on the Binocular vision random dot E(BVRDE) and Binocular vision circle(BVC) was 131.3 and 46.1" respectively, in normal children, and 265.1 and 161.4" respectively, in(X)T children. There were significant differences in distance stereoacuity between normal and(X)T children(p<0.05). However, no significant differences were found between the two groups in near Randot test(p>0.05). In(X)T children, the mean value of stereoacuity for BVRDE and BVC was 155.7 and 70.4" in patients with fusion and 317.9" and 205.3" in those without. There were significant differences in distance stereoacuity for BVRDE and BVC between(X)T children with fusion and without fusion by W4D test(p<0.05). CONCLUSIONS: The result of this study aid in the evaluation of normative distance stereoacuity data in normal children and in the evaluation of control of the deviation and sensory function status by distance stereoacuity measurement in(X)T children aged 4-10 years.
Child* ; Exotropia ; Humans ; Mentors ; Sensation ; Vision, Binocular

The purpose of this study is to determine if distance stereoacuity could be used as an objective means of assessing control in intermittent exotropia. We evaluated distance stereoacuity in 37 patients with intermittent exotropia showing orthophoria postopratively using the Mentor B-VAT II Videoacuity tester. All patients had fusion at near but 14 of 31 patients(38%) had fusion at distance preoperatively. The mean preoperative distance stereoacuities were 216 seconds with binocular vision circle(BVC) and 351 seconds with binocular vision random dot E(BVRDE) ( p=0.0002). The postoperative improvement was statistically significant with BVC(p=0.001), not statistically significant with BVRDE(p=0.7). On our results it seems to be easier to know BVC than BVRDE in children. It suggests that the BVC is a useful test for assessing control in intermittent exotropia.
Child* ; Exotropia* ; Humans ; Mentors ; Vision, Binocular

OBJECTIVES: To study the virtual reality-pattern visual evoked potential (VR-PVEP) P100 waveform characteristics of monocular visual impairment with different impaired degrees under simultaneous binocular perception and monocular stimulations. METHODS: A total of 55 young volunteers with normal vision (using decimal recording method, far vision ≥0.8 and near vision ≥0.5) were selected to simulate three groups of monocular refractive visual impairment by interpolation method. The sum of near and far vision ≤0.2 was Group A, the severe visual impairment group; the sum of near and far vision <0.8 was Group B, the moderate visual impairment group; and the sum of near and far vision ≥0.8 was Group C, the mild visual impairment group. The volunteers' binocular normal visions were set as the control group. The VR-PVEP P100 peak times measured by simultaneous binocular perception and monocular stimulation were compared at four spatial frequencies 16×16, 24×24, 32×32 and 64×64. RESULTS: In Group A, the differences between P100 peak times of simulant visual impairment eyes and simultaneous binocular perception at 24×24, 32×32 and 64×64 spatial frequencies were statistically significant (P<0.05); and the P100 peak time of normal vision eyes at 64×64 spatial frequency was significantly different from the simulant visual impairment eyes (P<0.05). In Group B, the differences between P100 peak times of simulant visual impairment eyes and simultaneous binocular perception at 16×16, 24×24 and 64×64 spatial frequencies were statistically significant (P<0.05); and the P100 peak time of normal vision eyes at 64×64 spatial frequency was significantly different from the simulant visual impairment eyes (P<0.05). In Group C, there was no significant difference between P100 peak times of simulant visual impairment eyes and simultaneous binocular perception at all spatial frequencies (P>0.05). There was no significant difference in the P100 peak times measured at all spatial frequencies between simulant visual impairment eyes and simultaneous binocular perception in the control group (P>0.05). CONCLUSIONS VR-PVEP can be used for visual acuity evaluation of patients with severe and moderate monocular visual impairment, which can reflect the visual impairment degree caused by ametropia. VR-PVEP has application value in the objective evaluation of visual function and forensic clinical identification.
Humans ; Evoked Potentials, Visual ; Vision, Ocular ; Vision, Binocular/physiology* ; Vision Disorders/diagnosis* ; Virtual Reality

Premacular hemorrhage (preretinal,subhyaloid, or sub-internal limiting membrane hemorrhage)impairs central vision abruptly and occurs in various underlying diseases. In cases of persistent hemorrhage, permanent impairment of vision may occur. Proposed therapeutic options for premacular hemorrhage consist of conservative treatment, laser photodisruption and early vitrectomy. Laser photodisruption may be performed in cases of persistent or slow-clearing hemorrhage, in patients with occupational need for prompt restoration of binocular vision or in patients with poor vision in their fellow eyes. The authors report 4 patients with premacular hemorrhage who were treated with Nd: YAG laser photodisruption with the review of the literatures.
Hemorrhage* ; Humans ; Lasers, Solid-State* ; Membranes ; Vision, Binocular ; Vitrectomy

We investigated the effect of experimentally induced anisometropia on binocular function. Unilateral myopia, hyperopia, or astigmatism(Axis 90degrees) was induced in eighteen adults with normal binocular function using softcontact lenses. Sensory status was assessed by measuring stereoacuity, Worth four dot test, and Bagolini lens test. Binocular function of all subjects decreased with increasing levels of anisometropia. In Worth four dot test, foveal suppression increased in proportion to the levels of anisometropia. Stereoacuity was similarly degraded by the induced anisometropia. Bagolinilens responses were normal in almost all subjects. Our study suggest that experimentally induced anisometropia cause significant abnormalities in binocular function in adults.
Adult ; Anisometropia* ; Humans ; Hyperopia ; Myopia ; Telescopes* ; Vision, Binocular*

The evaluation of stereoacuity provides relatively accurate assessment of binocular function. However, it is difficult to perform and also the reliability rate is low in the 2-to 5-year-old age range. We investigated the over-all success rate, the success rate according to age, and efficacy with the Randot preschool stereoacuity and Lang test in the 2-to 5-year-old children of 96 patients. The overall success rate of the two stereotests were 84. 4%, 47. 4%in the 2-year-old children and more than 87%in children over 3-year-old. When children with normal binocular vision were examined with the Randot preschool stereoacuity test, mean stereoacuity was 333 arc sec in the 2-year-age group, 135 arc sec in the 3-year-age group, 48 arc sec in the 4-year-age group, and 50 arc sec in the 5-year-age group. Sensitivity and specificity of Randot preschool stereoacuity test were 100%, 94. 2%, respectively. Sensitivity and specificity of Lang test were 100%, and 92. 4% respectively. As a result, Randot preschool stereoacuity and Lang stereotests might be considered easy available and valuable test for evaluating binocular function in the 3-to 5-year-old preschool children. Moreover, the Randot preschool stereoacuity provided a relatively accurate measurement of stereoacuity in the 3-to 5-year-old age range.
Child ; Child, Preschool ; Humans ; Sensitivity and Specificity ; Telescopes ; Vision, Binocular

To ensure the meridian can be measured and displayed correctly on the human body surface, a visualization method based on impedance and binocular vision is proposed. First of all, using alternating constant current source to inject current signal into the human skin surface, then according to the low impedance characteristics of meridian, the multi-channel detecting instrument detects voltage of each pair of electrodes, thereby obtaining the channel of the meridian location, through the serial port communication, data is transmitted to the host computer. Secondly, intrinsic and extrinsic parameters of cameras are obtained by Zhang's camera calibration method, and 3D information of meridian location is got by corner selection and matching of the optical target, and then transform coordinate of 3D information according to the binocular vision principle. Finally, using curve fitting and image fusion technology realizes the meridian visualization. The test results show that the system can realize real-time detection and accurate display of meridian.
Calibration ; Electric Impedance ; Electrodes ; Humans ; Meridians ; Vision, Binocular