Studies of Stereoacuity in Infants by the TV-Random Dot Stereo Test

Awaya, S; Mizukami, Yasuhiko; Kamiya, Ayumi; Koizumi, E; Miyake, Sampei

doi:10.1007/978-1-349-11188-6_14

Cited by 2 publications

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Section: Discussionmentioning

confidence: 99%

“…Studies [9,10,[26][27][28] assessed near stereoacuity thresholds and the state of convergence before and after surgery for constant and intermittent exotropia, but the impact of preoperative AC/A ratio, NPC and distance stereopsis on the outcome of exotropia surgery has not been sufficiently explored, and there is no agreement on this point. That is why we conducted analysis of the preoperative characteristics of the sensory system (near and distance stereopsis, and fusion on the synoptophore) and motor system (NPC, AC/A ratio, hypofunction and hyperfunction of the horizontal muscles, and angle of deviation) of the eye for the groups of patients who had orthotropia and those who had residual exotropia postoperatively.…”

Section: Discussionmentioning

confidence: 99%

“…Smaller initial deviations with hyperopic correction and fusion at distance indicated a favorable prognosis for stereoacuity improvement with surgery for exotropia[25]. It has been, however, concluded that (a) successful motor alignment did not guarantee recovery of suppression when the preoperative angle of exotropia was greater than 20 PD[25] and (b) the development of vergence did not account for the onset of stereopsis[26].Studies[9,10,[26][27][28] assessed near stereoacuity thresholds and the state of convergence before and after surgery for constant and intermittent exotropia, but the impact of preoperative AC/A ratio, NPC and distance stereopsis on the outcome of exotropia surgery has not been sufficiently explored, and there is no agreement on this point. That is why we conducted analysis of the preoperative characteristics of the sensory system (near and distance stereopsis, and fusion on the synoptophore) and motor system (NPC, AC/A ratio, hypofunction and hyperfunction of the horizontal muscles, and angle of deviation) of the eye for the groups of patients who had orthotropia and those who had residual exotropia postoperatively.…”

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Preoperative visual function characteristics having an effect on the success of exotropia surgery

Бойчук,

Тарак

2023

Oftalmol Zh

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Background: There are individual reports on the effect of some preoperative characteristics of visual functions (like convergence, angle of deviation, presence of fusion and type of binocular vision) on the success of exotropia surgery. To date, however, it has not been established what are the major diagnosis-related prognostic factors for the success of surgery for exotropia. Purpose: To identify the preoperative characteristics of visual functions which have an effect on the success of surgery for exotropia. Material and Methods: Of the 59 exotropes (age range, 10 to 21 years) included in this study, 33 had basic constant exotropia (group 1) and 26, intermittent exotropia (group 2). Patients underwent an ophthalmological and ortoptic examination of the motor and sensory systems of the eye. Patients with surgery success (postoperative orthotropes) were compared to those who had a residual exotropia of more than 10 prism diopters (PD) postoperatively in terms of the preoperative accommodative convergence–accommodation (AC/A) ratio, near point of convergence (NPC), distance stereopsis and near stereoacuity threshold. Results: Our analysis of the preoperative NPC, AC/A ratio and stereopsis for the group with postoperative orthotropic alignment and the group with postoperative exotropic alignment found preoperative close to normal values of AC/A ratio (4.0 ± 1.65 PD/D), NPC (8.03 ± 3.02 cm), the presence of distance stereopsis and near stereopsis (passing the 200 second of arc image on the Lang II stereo card) and the absence of medial rectus hypofunction of hyperfunction in 83.05% of patients of the former group. Conclusion: Preoperative close to normal values of AC/A ratio (4.0 ± 1.65 PD/D), NPC (8.03 ± 3.02 cm), the presence of distance stereopsis and near stereopsis (passing the 200 second of arc image on the Lang II stereo card) and the absence of medial rectus hypofunction of hyperfunction can be the factors favoring the success of exotropia surgery.

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Section: Discussionmentioning

confidence: 99%