Fitting Guides > I Kone
Fitting Guides
I Kone™ Lens
Fitting Guide
- Valley Contax invites you to learn about the most advanced & practical keratonconus science available today.
- The I Kone keratoconus design tackles centration difficulties and increases visual acuity through its unique bi-aspheric design.
- The larger optical zone results in better distribution of bearing zone, thus better centration.
- Exclusively manufactured in Boston XO.
The lens that everyone has been talking about has taken center stage in the keratoconus arena. Designed by optometrist and biomedical engineer, Dr. Rob Breece. The I Kone™ keratoconus design is exclusively from Valley Contax.
Now you can fit the Breece keratonconus lens.
The I Kone™ trial lens set is designed for maximum efficiency while allowing the practitioner the freedom to modify the standardized design, when needed. Another part of the I Kone™ is the expert consultation available through Valley Contax.
I Kone™ lens is the preferred keratonconus design exclusively from Valley Contax.
That means Valley Contax has complete and ultimate parameter control for quality and reproducibility. Purchase the I Kone™ lens with the Valley Contax Failsafe Warranty (credit is issued for each lens ordered within 90 days). Each credit is charged a button recovery fee or you may choose to order unwarranted.
The I Kone™ lens is available exclusively from Valley Contax in a wide range of parameters:
Base Curves: Any base curve radius
Powers: Made to order
Diameters: Suggested sizes 8.8, 9.6, & 10.4
Edge Lift:
| 2 steps steeper than standard | .04 less lift than standard |
| 1 step steeper than standard | .02 less lift than standard |
| Standard edge lift | |
| 1 step flatter than standard | .02 more lift than standard |
| 2 steps flatter than standard | .04 more lift than standard |
Parameter Selection:
Base Curve Selection
Select the lens which is closest to the steepest corneal curve. If reliable keratometry or corneal data is not available, select the 50.00 Diopter (6.75 mm) base curve lens from the trial lens set to begin the evaluation process.
Diameter Selection
Average size of diameter is a 9.6. Also available in 8.8 and 10.4 diameters.
Periphery/Edge Lift
The standardized periphery can be ordered steeper or flatter in steps that modify the edge lift in 0.02mm increments, if necessary.
Ordering the I Kone™ Lens
The specifications needed are:
- Base Curve Radius
- Lens Power
- Diameter
- Edge Lift Only (only if standard lift is not acceptable.)
| Lens Fitting | |
| The I Kone™ Lens utilizes a larger overall diameter to distribute the weight of the lens more evenly across the cornea. | |
| 1. | Begin with a base curve from the trial lens that is closest to the steepest corneal curve. |
| 2. | After evaluating the fluorescein pattern, make adjustments to the base curve, if necessary. |
| 3. | The base curve of the lens should not rest on the central cornea when determining the fit. |
| 4. | Continue to select base curves until a slight vault over the central cornea is accomplished. |
| 5. | The power is determined by a spherical refraction over the best fitting lens. The result should give a stable endpoint with acuity comparable to the best acuity expected from this patient. When ordering, adjust the lens power to reflect any change from the diagnostic base curve used in the over refraction. Also, remember to vertex over-refraction greater than 4.00 diopters. |
| 6. | The 9.6 overall diameter allows for a larger optical zone which provides better vision and reduces glare symptoms that are inherent with smaller lens designs. An 8.8 and 10.4 diameter is also available. |
| 7. | The peripheral curve on the back surface of the lens can be ordered steeper or flatter than the standard design of the diagnostic lens if necessary. Use slit lamp magnification, the periphery of the lens should appear to align with the underlining cornea and the edge should show adequate clearance. If the edge clearance is less than desired, the lens should be ordered with one step (.02) more lift. If the edge clearance appears to impinge on the cornea or there is no movement of the lens, the lens should be ordered with two steps (.04 mm) more lift. If the edge clearance is more than desired, the lens should be ordered with one step (.02 mm) less lift. If the edge rises significantly above the cornea and movement is excessive, the lens should be ordered with two steps (.04 mm) less lift. |
| Problem solving techniques | |
| 1. | Once a decentered lens is manually centered, you may determine that a steeper base curve of a least 0.1 mm, a steeper peripheral curve or a larger diameter is required. |
| 2. | A lens with excessive inferior edge lift may require a smaller diameter. |
| 3. | An inferior positioning lens may require a larger diameter. |
| 4. | A lens that exhibits mid peripheral bearing may need a larger optic zone or flatter periphery. |
Steve
President
"Valley Contax feels proud to be one of the select laboratories who have earned this prestigious award..."
"...as a reflection of the importance we place on quality."
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