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

Applicable eyes that lens can be positioned in the center of the cornea

Recommendation : Breath-O Correct HD

> Patients who have heavy stress on cornea using BOC sphere

> Patients with high power ortho-K

> Fitting Curve (FT) : 39.00D ~ 47.00D (0.50D increment)

> Target Power (TP) : -4.50D ~ -8.00D (0.50D increment)

Note : Fitting pattern of BOC HD is the same as BOC sphere.

Please check the fitting pattern using the BOC sphere trial lens

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

Fittings BOC TD

STEP 2 : CHOICE OF 1ST TRIAL LENS - BOC Sphere

PHASE 1 : Determine the Fitting Curve referring to average of keratometery data.

PHASE 2 : Calculate the different between the Fitting Curve and the flattest meridian

PHASE 3 : Determine the Target Power by adding the difference (step 2)

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

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

Fitting Curve ≒ AVG K (45.00)
Target Power = ?
Diameter = 10.6 (Standard Size)

DETERMINE THE TARGET POWER (TP)
CALCULATE THE DIFFERENCE BETWEEN FITTING CURVE & FLATTER MERIDIAN

Target Power ≒ S + (Flat K-Fit Curve)

Referring to KRT data:

Target Power =-4.50+(44.25-45.00) = -5.25

Final Target Power = -5.50*

*Adjusted by measuring the refractive power while wearing the lens.

1st Choice Trial lens as follow :

Fitting Curve (FC) = 45.00

Target Power (TP) = -5.50D

Diameter (D) = 10.6mm

> OVER REFRACTION

After fitting the appropriate trial lens , required additional power will be added on the trial lens Target Power.

Over Refraction ( Spherical Power) = 0.00 ~ +0.50D

* Measure the spherical power while wearing lens and check it is within +0.50D.

* More accurate values can be calculated by measuring over refreaction 30 ~45 minutes after wearing lens.

POSSIBLE RANGE TO ORDER

Fitting Curve Range

39.00D ~ 47.00D (0.50D increment stock range)

39.00D ~ 47.00D (0.25D increment pre-order range)

Target Power

-1.00D ~-8.00D (0.50D increment stock range)

-1.00D ~ -8.00D (0.25D increment pre-order range)

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.