TY - CHAP M1 - Book, Section TI - Chapter 12. Strabismus A1 - Motley, W. Walker A1 - Asbury, Taylor A2 - Riordan-Eva, Paul A2 - Cunningham, Emmett T. PY - 2011 T2 - Vaughan & Asbury's General Ophthalmology, 18e AB - Under normal binocular viewing conditions, the image of the object of regard falls simultaneously on the fovea of each eye (bifoveal fixation) and the vertical retinal meridians are both upright. Any ocular misalignment, such that only one eye views the object of regard with the correct vertical orientation, is called “strabismus.” The misalignment may be in any direction—inward, outward, up, down, or torsional. The amount of deviation is the angle by which the deviating eye is misaligned. Strabismus present under binocular viewing conditions is manifest strabismus, heterotropia, or tropia (see Box 12.1 for definitions). A deviation present only after binocular vision has been interrupted (eg, by occlusion of one eye) is called latent strabismus, heterophoria, or phoria. SN - PB - The McGraw-Hill Companies CY - New York, NY Y2 - 2024/03/29 UR - accessmedicine.mhmedical.com/content.aspx?aid=55783287 ER -