Although its use has declined, the major amblyoscope (discussed earlier; see Fig 7-7) was for decades a mainstay in the assessment and treatment of strabismus. The amblyoscope can measure horizontal, vertical, and torsional deviations and can be particularly helpful in adult strabismus. Because it can neutralize torsion, this instrument is useful for distinguishing between central fusion disruption (see Chapter 5) and inability to fuse because of a large cyclodeviation. The amblyoscope can also assess fusion ability, suppression, retinal correspondence, fusional amplitudes, and stereopsis. In addition, it may be used in exercises designed to overcome suppression and increase fusional amplitudes.
Figure 7-12 Afterimage test. A, Normal retinal correspondence. B, ARC in a case of esotropia. C, ARC in a case of exotropia.
(Modified with permission from von Noorden GK, Campos EC. Binocular Vision and Ocular Motility: Theory and Management of Strabismus. 6th ed. St Louis: Mosby; 2002:227.)
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.