1. 1. Rowsey JJ Reynolds AE Brown R. Corneal topography -corneascope. Arch Ophthalmol. 1981;99:93-1100.
2. 2. Hannush SB Waring GO et al. Reproducibility of corneal topographic measurements with keratometry photokeratoscopy and corneal modeling. (Abstract) Ophthalmology. 1988;95(suppl):163.
3. 3. Rowsey JJ Isaac MS. Corneoscopy in keratorefractive surgery. Cornea. 1983;2:133-141.
4. 4. Brungardt TF. Reliability of keratometric readings. Am J Optom Physiol Opt. 1969;9:686-691.
5. 5. Tate GW Safir S et al. Accuracy and reproducibility of keratometer readings. CLAO 1987;13:50-58.