[Progression of subjective refraction after artificial divergence surgery and its relation to a possible myopic spasm].
OBJECTIVE
To study the effect on subjective refraction of artificial divergence surgery in congenital nystagmus with blocking convergence.


METHODS
Retrospective study on 139 cases, with a study of visual acuity and optical correction with habitual glasses 1-5 years after operation, according to age and ocular alignment (orthophoria or exophoria).


RESULTS
Increased myopia with glasses of approximatively 1 diopter, but likely to be due to eye growth in this young population (mean age, 14 years). This myopic shift is higher in the exophoric population, but there is a tendency to prescribe a stronger correction to help control the phoria. A few rare cases of true myopic spasm were noted.


CONCLUSIONS
After artificial divergence surgery, true cases of increased myopia were rare. Tonic vergence is stronger than accommodative vergence.
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D000293:Adolescent; D000328:Adult; D000367:Age Factors; D002648:Child; D002675:Child, Preschool; D005099:Exotropia / Q000150:complications; D005500:Follow-Up Studies; D006801:Humans; D009216:Myopia / Q000209:etiology; D020417:Nystagmus, Congenital / Q000601:surgery*; D012189:Retrospective Studies; D013997:Time Factors; D014792:Visual Acuity