The I Kone Lens. Boston XO. Valley CONTAX. Springfield, OR. Manufactured in

Transcription

1 The I Kone Lens Manufactured in Boston XO Valley CONTAX Springfield, OR

2 Contact Lens Fitting Goals for Keratoconus Vision Comfort Corneal Health Fit / Centration Happy Patient

3 Selecting the Best Contact Lens Option Assessment of all of the Information History includes lens failures & why! Spectacle Rx, Keratometry, Topography Size, shape, location of effected area

4 Modern Keratoconic Corneal Lenses A Systematic approach to: Fitting standardized trial lens sets or topography realistic increments Troubleshooting logical, incremental changes flexibility

5 I-Kone Design Anterior and posterior aspheric design mm, 9.6 mm, 8.8 mm Boston XO Adjustable periphery 14 lens fitting set

6 Diagnostic Fitting I-Kone Keratoconus Design Initial Base Curve fit on Steep K reading 1. centration 2. central clearance Example: K s / mm (57.00 D) 9.6 mm diameter

7 Effect of the Base curve

8 Effect of the Base curve

9 I Kone Effect of Peripheral Curve 1 Step Flatter 2 Step Flatter 3 Step Flatter

10 The Keratoconic Cornea Assessment of ectatic area Size Location Shape Degree of Irregularity

11 The Keratoconic Cornea Assessment of ectatic area Keratometry Photokeratoscopy Topography Fluorescein Pattern Analysis Slit Beam 90 degree spin

12 Corneal Irregularity Keratometric View

13 The Keratoconic Cornea Assessment of ectatic area Keratometry Photokeratoscopy Topography Fluorescein Pattern Analysis Slit Beam 90 degree spin

14 Corneal Irregularity Photokeratoscopic View

15 The Keratoconic Cornea Assessment of ectatic area Keratometry Photokeratoscopy Topography Fluorescein Pattern Analysis Slit Beam 90 degree spin

16 Corneal Irregularity Topographic View

17 Corneal Topography in Keratoconus

18 The Keratoconic Cornea Assessment of ectatic area Keratometry Photokeratoscopy Topography Fluorescein Pattern Analysis Slit Beam 90 degree spin

19

20

21 Advanced Keratoconus

22 The Keratoconic Cornea Assessment of ectatic area Keratometry Photokeratoscopy Topography Fluorescein Pattern Analysis Slit Beam 90 degree spin

23 Corneal Irregularity Slit Beam View

24 The Keratoconic Cornea Assessment of ectatic area Keratometry Photokeratoscopy Topography Fluorescein Pattern Analysis Slit Beam 90 degree spin

25 90 Degree Spin

26 Classifications of Keratoconus Shape Mild < D average K Moderate > D average K Advanced > D average K Severe > D average K Size Nipple < 5 mm Oval 5 -> 6 mm Globus > 6 mm

27 Keratoconus

28 Nipple Shaped Keratoconus

29

30

31 Oval Shaped Keratoconus

32 Keratoglobus

33 Keratoconic Corneal Lens Options The First Generation Soper (circa 1970) 1st significant KC design Steep, fixed POZ McGuire Lens (circa 1980) Like Soper but multicurve

34 Keratoconic Corneal Lens Options The Second Generation Valley Kone (Valley Contax, 1990) Smooth, continuous back surface Rose K (Lens Dynamics, 1990) POZ varies with BC Standardized fitting system Rose K II (Blanchard, 2005) Aspheric front surface to reduce Spherical Lens Aberration

35 Keratoconic Lens Options the Third Generation I-Kone (Valley Contax, 2005) Bi-surface aspheric Balanced zone design (central zones to fit cone area) BC radius varied to achieve fit Periphery fits non-ectatic area

36 Keratoconic Lens Options the Third Generation Balanced Zone Design As BC radius steepens POZ decreases While Second Aspheric Width Increase Eccentricity of Zones Increase

37 Advantages of fitting the I Kone Design Central Fit extends the concept of 3 point touch high eccentricity back surface spreads bearing Vision front surface eccentricity to CANCEL out aberrations induced by eccentric BC and reduces other aberrations Comfort reduced pressure points Corneal Health Excellent tear flow

38 More advantages of fitting the I-Kone Design Aspheric Optics Controls spherical aberration Reduces lens mass Larger Diameter Distributes weight more evenly across corneal surface Reduces glare / halos Improves lens stability

39 The I Kone Lens 14 Lens Diagnostic Set Manufactured in Boston XO Diameter Size: 9.6 Diopter Range: 44.00D to 70.00D Valley CONTAX Springfield, OR