1. Federal University of São Paulo, Brazil
Corneal Biomechanical Properties and IOP Evaluation in patients with “Unilateral” Keratoconus
Karolinne Maia Rocha, MD
Wallace Chamon, MD
Federal University of São Paulo, Brazil
ASCRS 2008

2. Financial Disclosure
Authors have no financial interest in any of the technologies described

3. Purpose
To evaluate corneal hysteresis (CH), central corneal thickness (CCT), Goldmann applanation tonometry (GAT), dynamic contour tonometry (DCT) and non-contact tonometry (air-puff tonometer - NCT) in patients with “unilateral” keratoconus.

4. Methods
10 patients with unilateral keratoconus and no other ocular diseases or previous ocular surgeries underwent to :
ocular response analyser (ORA)
goldmann applanation tonometry (GAT)
dynamic contour tonometry (DCT)
non-contact tonometry (air-puff tonometer-NCT)
central corneal thickness (CCT)

5. Unilateral Keratoconus

6. Unilateral Keratoconus

7. ORA signal
Patient 2
Patient 3

9. Corneal Biomechanical Properties and IOP Evaluation in patients with Unilateral Keratoconus
Karolinne M Rocha & Wallace Chamon
Eyes (mean/SD)
Paquimetry
ORA CH
ORA CRF
IOPg
IOPcc
Pascal IOP
Goldmann
Keratoconus
n=10
486.60±34.34
7.99 ±1.40
7.09 ±1.66
11.2±2.59
14.93 ±2.24
13.87 ±1.27
10.78 ±1.64
Normal
±41.52
9.75 ±1.74
9.39 ±1.73
13.77 ±2.56
15.59 ±2.85
15.21 ±1.52
13.90 ±0.88

10. ORA x Goldmann x Pascal 10

11. Conclusion
The CCT, CH and intraocular pressure measured by GAT, NCT and ORA Goldmann-correlated IOP were consistently lower in the pronounced ectasic corneas when compared with the contralateral eyes.
There were no statistically significant differences between ORAcc and DCT measurements.