Essilor Medica 700, User Manual

Page: 160 / 216

Wave Analyzer Medica 700 User Guide
154
Configuring the Unit
CCT is the central corneal thickness in mm
Reference:
Ehlers N, Bramsen T, Sperling S. Applanation tonometry and central corneal thickness. Acta
Ophthalmol (Copenh) 1975; 53: 34–43
Whitacre
Formula:
Corrected IOP = Measured IOP – (CCT-560) × 2/100
Reference:
Whitacre MM, Stein RA, Hassanein K. The effect of corneal thickness on applanation
tonometry. Am J Ophthalmol 1993; 115: 592 – 596
Doughty 1 (for normal eyes)
Formula:
Corrected IOP = Measured IOP – (CCT-535) × 1.1/50
Reference:
Doughty MJ, Zaman ML. Human corneal thickness and its impact on intraocular pressure
measures: a review and meta-analysis approach. Surv Ophthalmol 2000; 44: 367–408
Doughty 2 (for glaucomatous eyes)
Formula:
Corrected IOP = Measured IOP – (CCT-535) × 2.5/50
Reference:
Doughty MJ, Zaman ML. Human corneal thickness and its impact on intraocular pressure
measures: a review and meta-analysis approach. Surv Ophthalmol 2000; 44: 367–408
Ehlers 2
Formula:
IOP correction = -0.0706 × CCT + 38.504
Reference:
Ashish A Patwardhan, Mohammad Khan, Susan P Mollan, Paul Haigh The importance of
central corneal thickness measurements and decision making in general ophthalmology
clinics: a masked observational study BMC Ophthalmology 2008, 8:1
Dresdner
Formula: