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Teller Acuity Cards Set of 8 Cards

Precision Vision

SKU : TAC8

The Teller Acuity Cards (TAC) are a test of grating acuity for infants, young children and individuals with special needs. It utilizes a preferential looking technique. This test has extensive evidence based on normative and clinical studies that provide a strong foundation for TAC applications in ophthalmology, optometry, and developmental practice.  The test is cited more often than any similar product compiled by The National Library of Medicine.

The Teller Acuity Cards (TAC) are a test of grating acuity for infants, young children and individuals with special needs. It utilizes a preferential looking technique. This test has extensive evidence based on normative and clinical studies that provide a strong foundation for TAC applications in ophthalmology, optometry, and developmental practice.  The test is cited more often than any similar product compiled by The National Library of Medicine.

A complete set of Teller Acuity Cards® II consists of sixteen 25.5 x 55.5 cm (10 x 22 inches) cards, each of which has an approximately 4-mm diameter peephole at the center and includes a Blank and gratings from .23 to 26.0 cycles/cm. Fifteen of the cards contain patches of square-wave gratings (vertical black-and-white stripes), approximately 12.5 x 12.5 cm in size, centered on one-half of the card. The gratings have a 50/50 duty cycle (black bar width = white bar width), with a contrast of approximately 60-70%. The left and right edge of each grating is finished with a black or white stripe of 1/2 of the usual width in order to minimize the visibility of the edge of the grating. These 15 cards have the following spatial frequencies (specified in cycles/cm): 0.32, 0.43, 0.64, 0.86, 1.3, 1.6, 2.4, 3.2, 4.8, 6.5, 9.8, 13.0, 19.0, 26.0, and 38.0, with approximately one-half (½) octave difference in spatial frequency between cards.

The Teller Visual Acuity Cards Half Set includes 8 cards ranging from .23 to 26.0 cycles/cm

SKU: TAC8 Categories: ,
Brands

Precision Vision

Specified in cycles/cm 0.32, 0.43, 0.64, 0.86, 1.3, 1.6, 2.4, 3.2, 4.8, 6.5, 9.8, 13.0, 19.0, 26.0, and 38.0, with approximately one-half (½) octave
8 cards ranging  .23 to 26.0 cycles/cm
Set Size 8