13.內斜視（esotropia）常與下列何種屈光異常有關？
(A)近視（myopia）
(B)遠視（hypermetropia）
(C)老花（presbyopia）
(D)散光（astigmatism）

Accommodative esotropia is the most common cause of esotropia in children. To focus properly on a near object, the ciliary muscle must alter the shape of the lens (accommodation), and both eyes must move inward (convergence). In children who have normal ocular alignment, accommodation is associated with a predictable and physiologic amount of convergence. In children who have accommodative esotropia, the physiologic convergence cannot be overcome by fusional divergence (ie, movement of the eyes away from each other to restore binocular vision), and as a result, esotropia occurs. Accommodative esotropia occurs more commonly in children who have hyperopia (farsightedness).

遠視、斜視、弱視三位一體