Alfonso Eye Speculum

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.