Tomey UD-800 - Page 134

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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 value
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