Federal University of São Paulo, Brazil

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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

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

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.

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)

Unilateral Keratoconus

Unilateral Keratoconus

ORA signal Patient 2 Patient 3

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 527.20 ±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

ORA x Goldmann x Pascal 10

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.