Initial Experience with

the 355º Keraring

Luis Cadarso

Hospital Meixoeiro Vigo

Clinica Cadarso

Vigo. Spain

No financial interests related to this topic

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

• 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

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

• 80% thickness at ∅ 5,7 mm

• Minimum depth 300µm

• Inner ∅ 5 mm

• Outer ∅ 6,5 mm

• Incision axis: Steep Meridian

Femtosecond Laser TunnelVisumax 500Hz (Zeiss)

Femtosecond Laser TunnelVisumax 500Hz (Zeiss)

• 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

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

Preop Postop

PreopPostop Dif

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