Grating Acuity
Showing all 8 results
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Grating Acuity, Pediatric Opthalmology
OSU Ohio Contrast Cards Set of 11 Cards
For the Ohio Contrast Cards contrast sensitivity test, we chose a very low spatial frequency square wave because human contrast sensitivity, when measured with square-wave gratings, is empirically high and constant over a wide range of very low spatial frequencies. 5,17–19 Therefore, the visibility of a square-wave grating does not depend very much on spatial frequency over this range (red squares and it is much closer to the peak value of the contrast sensitivity function than what is reported for sine wave stimuli (compare red squares and blue diamonds. A, which we show because those authors also used large stimuli and unlimited viewing time; see also Carney et al. 20 and Watson and Ahumada 21. The red curve. A was predicted by the standard model of contrast detection 20,21 applied to square waves of constant area, fitted to the square-wave data. A by transposing it rigidly relative to log axes to minimize the sum of squared residuals.
SKU: 3503 -
Pediatric Opthalmology, Grating Acuity
Ohio State University Newborn Acuity Charts
The Newborn Acuity Cards is a card-based test of visual acuity designed for use on infants under 6 weeks of corrected age (or under 46 weeks of gestational age). The test consists of 10 gray cards, each containing a visual acuity grating, plus a blank card. The patient fixates or tracks the grating if it is visible, and the examiner makes an integrated judgment of whether the patient sees the grating or not. The test takes about 12 minutes on an awake, generally healthy infant.
SKU: 3501 -
Pediatric Opthalmology, Grating Acuity
Teller Acuity Cards Set of 8 Cards
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.
SKU: TAC8 -
Grating Acuity, Pediatric Opthalmology, Stereo Acuity Testing
City Cardiff Preferential Looking Acuity Test Set
Grating Acuity, Pediatric Opthalmology, Stereo Acuity TestingCity Cardiff Preferential Looking Acuity Test Set
The City-Cardiff Acuity Test have been developed by a team of clinical vision scientists at City and Cardiff Universities to provide a rapid means of assessing infant visual acuity.
SKU: 680600 -
Cognative Vision, Distance Visual Acuity Test, Grating Acuity, LEA Core Test, Near Visual Acuity Testing, Pediatric Opthalmology
LEA GRATINGS Low Contrast Grating Acuity Test
Cognative Vision, Distance Visual Acuity Test, Grating Acuity, LEA Core Test, Near Visual Acuity Testing, Pediatric OpthalmologyLEA GRATINGS Low Contrast Grating Acuity Test
Measurement of contrast sensitivity curve is based on 4 gratings at 2 Contrast levels, 10%, and 2.5% contrast using 2 grating frequencies: 0.5 cpcm and 8 cpcm (10% level) or 0.5 cpcm and 4 cpcm (2.5% level).
SKU: 253400 -
Cognative Vision, Distance Visual Acuity Test, Examination tools, Grating Acuity, LEA Core Test, Pediatric Opthalmology, Vision Screening Test
LEA Core Tests Starter Toolkit For Assessment and amp Screening
Cognative Vision, Distance Visual Acuity Test, Examination tools, Grating Acuity, LEA Core Test, Pediatric Opthalmology, Vision Screening TestLEA Core Tests Starter Toolkit For Assessment and amp Screening
Lea Hyvärinen, MD, PhD, has created numerous vision assessment and screening products since designing her LEA SYMBOLS® (apple, house, circle, square) in 1976. Over time, individualized eye chart variations using LEA SYMBOLS® were created for various vision screening programs.
SKU: 258600 -
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Grating Acuity, Pediatric Opthalmology
Teller Acuity Cards
The Teller Acuity Cards is a test of grating acuity for infants, young children and individuals with disabilities utilizing a preferential looking technique. This test has an extensive evidence base in normative and clinical studies that provide a strong foundation for applications in ophthalmology, optometry, and developmental practice. The test is cited more often than any similar product in the health information compiled by The National Library of Medicine.
SKU: TAC16
