The base-to-base induced-tropia prism test for detection of XXXX : a pilot study.

@entity1 @entity5971 @entity4457
PURPOSE: To investigate the accuracy of the base-to-base prism test (BBPT), which entails inducing an @entity5971 with the use of base-in prisms before each eye, in the diagnosis of @entity4457 . METHODS: @entity1 were consecutive @entity1 recruited from a pediatric ophthalmology practice who were able to perform logMAR acuity testing. All @entity1 underwent an orthoptic examination, including logMAR visual acuity testing, and a sensorimotor evaluation. @entity1 with an interocular difference of 2 or more lines were considered to have @entity4457 . Fixation preference was assessed by use of both the vertical fixation test and the BBPT. The agreement between the BBPT and visual acuity was analyzed and compared with the agreement between the vertical fixation test and visual acuity. RESULTS: Fifty-one consecutive @entity1 aged 4 to 17 (mean, 9.8 years; SD    3.4) were included, of whom 11 were diagnosed with @entity4457 . Kappa analysis showed moderate but significant agreement between the BBPT and logMAR (k = 0.453, p = 0.001), whereas the vertical fixation test demonstrated only a fair agreement (k = 0.254, p = 0.061). The overall sensitivity for the BBPT was 72.7% (95% confidence interval [95% CI], 43.4%-90.3%) but only 40% for the vertical fixation test (95% CI, 16.8%-69.7%). For the BBPT, specificity was 80% (95% CI, 65.2%-89.5%); for the vertical fixation test, 78% (95% CI, 63.3%-88.0%). CONCLUSIONS: The BBPT appears to be more sensitive than the vertical fixation test for detecting @entity4457 in our @entity1 population. The 2 tests had similar specificity.
