Tomey AL-100 User Manual

4-2
d. Personal A-constant
A = P + AREFxRF + 2.5L + 0.9K - COR
Where:
P: Power of IOL implant (D)
AREF: Postoperative refraction <equivalent to the
spherical index (D)
= S + C/2
C: Cylindrical index (D)
S: Spherical index (D)
RF: Refractive factor
if P >16, then RF = 1.25
if P  16, then RF = 1
L: Axial length
K: Average corneal refraction (D)
(K1 + K2) / 2
COR: Correcting value
if L < 20.0, then COR = 3
if 20.0 < L < 21.0, then COR = 2
if 21.0 < L < 22.0, then COR = 1
if 22.0 < L < 24.5, then COR = 0
if L> 24.5, then COR = -0.5

Tomey AL-100 Specifications

General

Brand	Tomey
Model	AL-100
Category	Measuring Instruments
Language	English