[Screening and treatment of fixation dominance in primary microstrabismus].

The Gracis biprism appears to be the best actual method of testing eye fixation as early as 6 months. It is the appropriate test for microstrabismus screening. The treatment of the late onset microstrabismus is more simple than the treatment of the early onset microstrabismus, where the dominance of fixation is stronger. If the calibrated filters are sufficient in the first case, the optical penalisation (+ 2 D to + 3 D) on the dominant eye is the best long-term treatment in primary microstrabismus. Based on the specific aspects of the early onset strabismus, such as bi-ocularity and latent nystagmus, optical penalization without atropine offers an alternative long-term method to occlusion without any trouble of visual development of the fixating eye.