PubMed · 868998
Tangent screen perimetry using twin test objects.
Abstract
A T-shaped carrier with twin test objects is an inexpensive efficient visual field screening device which facilitated identification of a nasal steppe, a paracentral scotoma, an enlarged blind spot, an arcuate scotoma, macular sparing, or hemianopic defects.
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J T Coyle, D F Milam. 1977. Tangent screen perimetry using twin test objects.. https://doi.org/10.1016/0002-9394(77)90926-6
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