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Overestimation of stereo thresholds by the TNO stereotest is not due to global stereopsis

Content Provider	Scilit
Author	Vancleef, Kathleen Read, Jenny C. A. Herbert, William Goodship, Nicola Woodhouse, Maeve Serrano‐Pedraza, Ignacio
Copyright Year	2017
Description	Journal: Ophthalmic and Physiological Optics It has been repeatedly shown that the TNO stereotest overestimates stereo threshold compared to other clinical stereotests. In the current study, we test whether this overestimation can be attributed to a distinction between ‘global’ (or ‘cyclopean’) and ‘local’ (feature or contour‐based) stereopsis. We compared stereo thresholds of a global (TNO) and a local clinical stereotest (Randot Circles). In addition, a global and a local psychophysical stereotest were added to the design. One hundred and forty‐nine children between 4 and 16 years old were included in the study. Stereo threshold estimates with TNO were a factor of two higher than with any of the other stereotests. No significant differences were found between the other tests. Bland‐Altman analyses also indicated low agreement between TNO and the other stereotests, especially for higher stereo threshold estimates. Simulations indicated that the TNO test protocol and test disparities can account for part of this effect. The results indicate that the global – local distinction is an unlikely explanation for the overestimated thresholds of TNO. Test protocol and disparities are one contributing factor. Potential additional factors include the nature of the task (TNO requires depth discrimination rather than detection) and the use of anaglyph red/green 3D glasses rather than polarizing filters, which may reduce binocular fusion.
Related Links	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5516234/pdf
Ending Page	520
Page Count	14
Starting Page	507
e-ISSN	14751313
DOI	10.1111/opo.12371
Journal	Ophthalmic and Physiological Optics
Issue Number	4
Volume Number	37
Language	English
Publisher	Wiley-Blackwell
Publisher Date	2017-03-23
Access Restriction	Open
Subject Keyword	Journal: Ophthalmic and Physiological Optics Mathematical Psychology Randot Stereotest Global Stereopsis Local Stereopsis Random Dot Stereogram Stereo Threshold Tno Stereotest
Content Type	Text
Resource Type	Article

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