FITTING STEPS

STEP 1 : SCREENING

EASY CALCULATION

Effectiveness is related to “Target Power” and “Shape of cornea”.
Generally, the higher the Target power is, the less effective it is.
Our recommended way to judge applicability is the calculation formula:

(Flatter meridian) - (Target power) ≧ 39.00

For example, if the Flatter meridian is 44.00 D, target power under -5.00 D

ESTIMATION FROM TOPOGRAPHY PATTERN

Non-applicable eyes that cannot be well- centered

if fitted with BOC sphere

RECOMMENDATION :

Prescribe BOC TD ( Toric Design) ,

if corneal astigmatism > -1.50DC

STEP 2 : CHOICE OF 1ST TRIAL LENS - BOC TD (TORIC)

PHASE 1 : Determine the Fitting Curve referring to Flattest of Keratometery (Flat K) data.

PHASE 2 : Determine the Target Power by Spherical Refraction is recommended

PHASE 3 : Determine the Cylinder Power (CYL) via topographer .

PHASE 4 : Diameter is 10.6 mm ( standard diameter for trial lens)

DETERMINE THE FITTING CURVE (FT)
REFERRING TO FLATTEST OF KRT DATA

Fitting Curve ≒ FLAT K (43.00)
Target Power = ?

Cylinder Power = ?
Diameter = 10.6 (Standard Size)

DETERMINE THE TARGET POWER (TP)
REFER TO SPHERICAL REFRACTION

Target Power ≒ Spherical Refraction

Referring to KRT data:

Target Power =-3.00

DETERMINE THE CYLINDER (CYL) VIA TOPOGRAPHER

HOW TO DETERMINE THE CYLINDER (CYL)?

Average Elevation Difference between the flattest and the steepest meridians at 4mm of topographer. Refer below:

IF TOPOGRAPHERS IS NOT AVAILABLE

Calculate the difference between Steepest K and Flattest K

STEEP K - FLAT K is recommended CYL ( CYL-2.00DC)

1st Choice Trial lens as follow :

Fitting Curve (FC) = 43.00

Target Power (TP) = -3.00D

Cylinder Power (TC) = -2.00DC

Diameter (D) = 10.6mm

LENS SPECIFICATION SUMMARY

POSSIBLE RANGE TO ORDER

Fitting Curve Range

39.00D ~ 47.00D (0.25D increment)

Target Power

-1.00D ~ -8.00D (0.25D increment)

Cylinder Power (Toric)

-1.00DC, -1.50DC, -.2.00DC, -2.50DC, -3.00DC

(0.50DC increment)

Lens Diameter

10.2 mm

10.6 mm [Standard Diameter]

11.0 mm

STEP 3 : FITTING CONDITION

Criteria for the fitting condition after 15 minutes of lens wear
Lens is proper centered.
Lens move 1~2 mm at blinking.
A proper doughnut pattern is achieved, and also the optical zone as wide as 3 mm.
Vision correction needed by patient should be obtained and stable, and wearing feeling is comfortable.

GOOD FITTING

Criteria for fitting condition after 15 minutes of lens wear
Lens is proper centered.
Lens move 1~2 mm at blinking.
A proper doughnut pattern is achieved, and also the optical zone as wide as 3 mm.
Vision correction needed by patient should be obtained and stable, and wearing feeling is comfortable.