Abbreviations for Types of Strabismus
Addition of the prime symbol (′) to any of the following indicates that measurement of ocular alignment is made at near fixation (eg, E′ indicates esophoria at near).
O = O Orthophoria (orthotropia).
E, X, RH, LH Esophoria, exophoria, right hyperphoria, left hyperphoria at distance fixation, respectively.
ET, XT, RHT, LHT Constant esotropia, exotropia, right hypertropia, left hypertropia at distance fixation, respectively.
E(T), X(T), RH(T), LH(T) Intermittent esotropia, exotropia, right hypertropia, left hypertropia at distance fixation, respectively. The addition of parentheses around the T indicates an intermittent tropia.
RHoT, LHoT Right hypotropia, left hypotropia at distance fixation, respectively.
OEAd or IOOA Overelevation in adduction or inferior oblique overaction, respectively.
ODAd or SOOA Overdepression in adduction or superior oblique overaction, respectively.
UDAd or SOUA Underdepression in adduction or superior oblique underaction, respectively.
UEAd or IOUA Underelevation in adduction or inferior oblique underaction, respectively.
DSC Dissociated strabismus complex.
DHD, DTD, DVD Dissociated horizontal deviation, dissociated torsional deviation, dissociated vertical deviation, respectively.
Excerpted from BCSC 2020-2021 series: Section 10 - Glaucoma. For more information and to purchase the entire series, please visit https://www.aao.org/bcsc.