Dawson Emma, Adams Gill, Mengher Lak, Lee John
Moorfields Eye Hospital, London, UK.
Strabismus. 2009 Oct-Dec;17(4):171-4. doi: 10.3109/09273970903353246.
Cyclic strabismus is a rare disorder in which manifest strabismus and controlled latent deviation (heterophoria) alternates on a regular pattern which is usually over a 48-hr period. During the "straight" period the patient has a fully controlled heterophoria for all distances, with very good fusion and stereopsis. During the "squinting" period the patient has a constant manifest strabismus for all distances, with no demonstrable fusion and stereopsis.
We describe 2 cases of alternate day exotropia. One patient requires strabismus surgery to obtain constant binocularity. The second patient underwent surgery for an intermittent exotropia and subsequently developed an alternate day exotropia. The condition very gradually reduced over the years and the patient is now fully binocular.
We report the first 2 cases of cyclic exotropia in non-Japanese female children presenting from about 1 to 3 years of age, without ocular or systemic pathology.
周期性斜视是一种罕见的疾病，显性斜视和可控制的潜在偏斜（隐斜视）以通常在48小时内的规律模式交替出现。在“正位”期，患者在所有距离下都有完全可控制的隐斜视，融合和立体视良好。在“斜视”期，患者在所有距离下都有恒定的显性斜视，没有可证实的融合和立体视。
我们描述了2例隔日外斜视病例。一名患者需要进行斜视手术以获得持续的双眼视。第二名患者接受了间歇性外斜视手术，随后发展为隔日外斜视。多年来病情逐渐减轻，患者现在双眼视功能完全正常。
我们报告了首例2例非日本籍1至3岁女童的周期性外斜视病例，无眼部或全身病变。
