Fig 7. Evaluation of predictive ability of laser acuity determination. Comparison of preoperative and postoperative letter acuity in patients with cataract (dark boxes) and corneal opacities (light boxes). Corneal patients with active graft rejection are not included. (From Green DG, Cohen MM: Laser interferometry in the evaluation of potential macular function in the presence of opacities in the ocular media. Trans Am Acad Ophthalmol Otolaryngol 75:629, 1971 and Gstalder RJ, Green DG: Laser interferometry in corneal opacification. Arch Ophthalmol 87: 269, 1972.)