Presentation given at the Total Keratoconus Solution user meeting organized by Mediphacos at 2014 ACSRS

1. Initial Experience with
the 355º Keraring
Luis Cadarso
Hospital Meixoeiro Vigo
Clinica Cadarso
Vigo. Spain
No financial interests related to this topic

2. Keraring SI-355º
• Arc Length 355º
• Inner ∅ 5 mm
• Outer ∅ 6,4 mm
• Thickness: 200 µm, 300 µm
Long Arc Length ICR for Central KC

3. • Main Indication
• Central Nipple KC
• Requisites:
• Central Cone w Low Astigmatism
• K max < 70 D
• CCT > 400 µm
• Central Cornea must be transparent
Keraring SI-355º

4. Nomogram
• SI 355º 200µm →SE ≤ 6 diopt
• SI 355º 300µm →SE > 6 diopt
Keraring SI-355º
The 5º gap must be along the incisional axis
Tunnel made w Femtosecond laser is mandatory

5. • 80% thickness at ∅ 5,7 mm
• Minimum depth 300µm
• Inner ∅ 5 mm
• Outer ∅ 6,5 mm
• Incision axis: Steep Meridian
Femtosecond Laser Tunnel
Visumax 500Hz (Zeiss)

6. Femtosecond Laser Tunnel
Visumax 500Hz (Zeiss)

7. • 4 eyes of 4 pat. with central KC
• 3 OD and 1 OS
• Age: 17, 28, 29, 37 yo
• Sex: 2 ♂ and 2♀
Study Population

8. Results 1 month Follow-up
Preop Postop
UDVA 0.08 0.19
CDVA 0.4 0.55
Sphere -9,69 ± 5,7 -4,88 ± 4,31
Cylinder -2,38 ± 1,9 -1 ± 1,41
Km 52,46 48,89
Keraring SI 355 / 200µm in all the patients

9. Preop Postop

10. PreopPostop Dif

11. CONCLUSIONS
Implantation of the Keraring 355º
• Improved Visual Acuity
• Reduced Myopic and Astigmatic components
• Flattened and Regularized the central cornea
• Safe in this small group of patients