FERREE-RAND DOUBLE BROKEN CIRCLES

a figure that is used to test for visual acuity and astigmatism. A gap size is for acuity and if one gap is easier to see than another an astigmatism is present.

FERREE-RAND DOUBLE BROKEN CIRCLES: "The Ferree-Rand double broken circles tests our sight."
Cite this page: N., Pam M.S., "FERREE-RAND DOUBLE BROKEN CIRCLES," in PsychologyDictionary.org, May 11, 2013, https://psychologydictionary.org/ferree-rand-double-broken-circles/ (accessed October 14, 2019).
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