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Mike P. Holzer, MDAnnett Mannsfeld, MSc
Angela Ehmer, MSc
Gerd U. Auffarth, MD
[email protected] www.lasik-hd.de
International Vision Correction Research Centre
Dept. of Ophthalmology, University of Heidelberg, GermanyActing chairman: G.U. Auffarth, MD
Corneal changes following INTRACOR
femtosecond laser treatment
Study and research has
been supported by
Technolas Perfect Vision GmbH, Heidelberg, Germany
Femtosecond Laser: Femtec
Mike P. Holzer, MD
Femtec (Technolas Perfect Vision GmbH, Heidelberg, Germany) CE mark FDA 510k clearance 40 kHz
FEMTEC fixation of eye:
Curved patient interface
less stress on cornea
less suction pressure
INTRACOR
• Purely intrastromal refractive
treatment with Femtec Laser
• No cut of epithelium,
Bowman‘s or Descemet
• No incision, pockets etc.
• Cut design and stromal depth
algorithm depending on
refractive error
• Duration approx. 20 seconds
Mike P. Holzer, MD
Patients & Methods
• Ongoing prospective, multicenter study
• Approval of Ethics Committee (Univ. of Heidelberg)
• Intrastromal correction of presbyopia
• 25 patients treated between July & Sept. 2008
• Age 56.2 ± 5.79 years (range 47 – 67 years)
• Up to 6 months postoperative follow up
• Minimum near add +2.0 D
• Non dominant eye treatedMike P. Holzer, MD
4 days preop
INTRACOR Presbyopia
Mike P. Holzer, MD
4 days preop 1 hour postop 1 week postop
1 hour postop
Cavitation gas in ring cuts
1 day postop
Gas escaped from cornea
Development near UCVA
Mike P. Holzer, MD
0.7 = 20/100 0.26 = 20/30
n=25 n=25 n=25 n=25 n=24
* p < 0.01Friedman-Test
*
DCNVA:0.23 ± 0.08 logMAR
Near and distance visual acuity
Distance correction
preop 3M postop
Sphere +0.75 D ± 0.23 D +0.15 ± 0.31 D
Cylinder -0.33 D ± 0.17 D -0.42 ± 0.23 D
preop D1 W1 M1 M3
UCDVA 0.11 ± 0.11 0.09 ± 0.10 0.06 ± 0.08 0.06 ± 0.09 0.05 ± 0.10
BCDVA -0.06 ± 0.06 na na -0.02 ± 0.06 0.00 ± 0.07
UCNVA 0.70 ± 0.16 0.39 ± 0.25 0.39 ± 0.22 0.36 ± 0.18 0.26 ± 0.21
DCNVA 0.59 ± 0.12 na na 0.33 ± 0.17 0.23 ± 0.18
BCNVA -0.04 ± 0.08 na na 0.01 ± 0.10 -0.03 ± 0.07
Mike P. Holzer, MD
Corneal asphericity
Mike P. Holzer, MD
pre anterior
preposterior
1M anterior
1M posterior
3M anterior
3M posterior
Mean value
-0.20 -0.34 -0.25 -0.43 -0.26 -0.41
Std. Dev. 0.16 0.16 0.16 0.18 0.18 0.18
Q-value (6.0 mm)
Q-value more negative following INTRACOR treatment
Summary: INTRACOR
• High potential for correction of presbyopia
• Non invasive very low risk for infections
• Stable refractive outcome during follow up period
• Significant gain in uncorrected near visual acuity
• Slight central steepening and negative q-value
• No weakening of cornea
• Future treatments: low myopia / hyperopia / astigmatism,
retreatments of remaining refractive errors following
IOL- or Excimer Laser Surgery
Mike P. Holzer, MD