Tomey UD-8000 - Page 308

■ 4-2
4. Personal A-Constant
A = P + AREF･RF + 2.5L + 0.9K - COR
Where:
AREF: Eye refractive power after surgery (D)
RF : Refractive factor
P > 16 → RF = 1.25
P ≤ 16 → RF = 1
COR : Correction
L < 20.0 → COR = 3
20.0 ≤ L < 21.0 → COR = 2
21.0 ≤ L < 22.0 → COR = 1
22.0 ≤ L < 24.5 → COR = 0
24.5 ≤ L → COR = -0.5