Measurement of Posterior Corneal Astigmatism by the IOLMaster 700

Both anterior and posterior corneal astigmatism contribute to total corneal astigmatism. However, “total” corneal astigmatism traditionally has been calculated based on anterior corneal measurements alone using a fixed ratio describing the relationship between the anterior and posterior corneal surfaces. Precise and reliable measurement of total corneal astigmatism and its simple incorporati on into lens formulas is the holy grail of biometry. Calculating intraocular lens (IOL) powers by incorporating additional knowledge of the precise shape of the posterior corneal surface would potentially

Source: Journal of Refractive Surgery - May 9, 2018 Category: Opthalmology Authors: Benjamin R. LaHood, MBChB, PGDipOphthBS, FRANZCO Source Type: research