Dreyfus Opticians provides eye examinations and a variety of eyewear collection. Based in Yardley, Pa., its testing services includes visual acuity, color vision, depth perception, refractive error, accommodation, binocularity, peripheral vision and ocular health evaluation. The optical retailer also specializes in providing contact lens examinations, visual information processing analysis and vision therapy. Additionally, Dreyfus Opticians offers La Loop eyewear necklaces and eyewear consultation services. The retailer stocks products from major brands, including Paul Smith, Martin & Martin, Robert Marc, Frederic Beausoleil, FreudenHaus, Barton Perreira and Badgley Mischka Couture.