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[Progression of subjective refraction after artificial divergence surgery and its relation to a possible myopic
111, rue de la Ravinelle, 54000 Nancy.
Purpose:
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.
Conclusion:
After artificial divergence surgery, true cases of increased myopia were rare. Tonic vergence is stronger than accommodative vergence.