REVIEW OF PAST AND PRESENT TECHNIQUES OF MEASURING CORNEAL TOPOGRAPHY

Various methods of measuring corneal topography are described. The adv antages and disadvantages of the principles used in the measurement of corneal shape by the various techniques are discussed. The corneal su rface may be described in a number of ways; some researchers have used conic sections while others have used more complex polynomial express ions. Computer algorithms have also been developed to calculate quanti tative measures of corneal topography to augment the information obtai ned from topographical maps. These descriptors are discussed in this a rticle.