Studies on the function of the checkerboard pattern stimulator: analysis of ocular positions during stimulation.
OBJECTIVE
To analyze the effectiveness of the checkerboard pattern stimulator (CPS) in facilitating stereopsis in patients with acquired esotropia.


METHODS
Fourteen patients were treated with checkerboard pattern stimulation following surgical correction of the ocular alignment. In order to determine the cause of the difference in the effectiveness of CPS on exotropes and esotropes, a separate study was carried out on 15 subjects: 5 orthophores, 5 exophores, and 5 esophores.


RESULTS
Eight of the 14 patients achieved stereopsis; the remaining 6 cases did not show marked improvement in stereoacuity. The CPS was more effective on exotropes, as reported previously, than on esotropes (P = 0.047, chi2 test). By recording the ocular positions of the 15 subjects in the separate study, we found a tendency toward exodeviation in the orthophoric and exophoric subjects but not in esophoric subjects.


CONCLUSIONS
Our results suggest that CPS develops sensory fusion by providing an identical pattern simultaneously to the foveas of both eyes and has no effect on convergence training and motor fusion.
Hayashi
K
K
Department of Ophthalmology, Nagoya University School of Medicine, Aichi, Japan.
Sato
M
M
Awaya
S
S
D000293:Adolescent; D000328:Adult; D002648:Child; D003867:Depth Perception / Q000502:physiology*; D005133:Eye Movements / Q000502:physiology*; D006801:Humans; D009801:Oculomotor Muscles / Q000503:physiopathology / Q000601:surgery; D013508:Ophthalmologic Surgical Procedures; D010364:Pattern Recognition, Visual / Q000502:physiology*; D010775:Photic Stimulation; D013285:Strabismus / Q000175:diagnosis / Q000503:physiopathology* / Q000601:surgery