Barrett True K Formula - for prior myopic or hyperopic lasik/prk/rk + kc
K Index 1.3375
K Index 1.332
Patient Data
Universal Formula
Formula Guide
Enter Data and Calculate
Doctor Name
Patient Name
Required Field
Patient ID
Lens Factor
(-2.0~5.0)
Outside Range
or A Constant
(112~125)
Outside Range
Personal Constant
Alcon SN60WF
Alcon SN6AD
Alcon SN6ATx
Alcon SND1Tx
Alcon SV25Tx
Alcon SA60AT
Alcon MN60MA
J&J ZCB00
J&J ZCT
J&J ZCT(USA)
J&J AR40e
J&J AR40M
J&J ZXR00
J&J ZXT
Zeiss 409M
Zeiss 709M
Hoya iSert 251
Hoya iSert 351
Bausch & Lomb MX60
Bausch & Lomb MX60T
Bausch & Lomb BL1UT
Bausch & Lomb LI60AO
MBI T302A
Lenstec SBL-3
SIFI Mini WELL
Rayner-T Flex
History OD:
Myopic Lasik
Hyperopic Lasik
Radial Keratotomy
Keratoconus
History OS:
Myopic Lasik
Hyperopic Lasik
Radial Keratotomy
Keratoconus
Pre-Lasik Ref. (R)
Post-Lasik Ref. (R)
Pre-Lasik Ref. (L)
Post-Lasik Ref. (L)
Measurements:
OD
OS
Axial Length (R)
(12~38 mm)
Outside Range
Axial Length (L)
(12~38 mm)
Outside Range
Measured K1 (R)
(30~60 D)
Outside Range
Measured K1 (L)
(30~60 D)
Outside Range
Measured K2 (R)
(30~60 D)
Outside Range
Measured K2 (L)
(30~60 D)
Outside Range
Optical ACD (R)
(0~6 mm)
Outside Range
Optical ACD (L)
(0~6 mm)
Outside Range
Target Ref. (R)
(-10~10 D )
Outside Range
Target Ref. (L)
(-10~10 D)
Outside Range
Optional:
Lens Thickness (R)
(2~8 mm)
Outside Range
Lens Thickness (L)
(2~8 mm)
Outside Range
WTW (R)
(8~14 mm)
Outside Range
WTW (L)
(8~14 mm)
Outside Range