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This abstract is assigned to session SB0-BOG Free paper: Glaucoma/Glaucome

Title	Correlation between ocular response analyzer (ORA) and dynamic contour tonometer (PDCT) parameters
Abstract Nr.	222

Purpose	The ORA measures corneal biomechanical properties: CH and CRF. The PDCT measures OPA, the systolo-diastolic variation of IOP. Both ORA and OPA values are lower in glaucoma than normal patients. Our purpose is to assess if there is a correlation between ORA and OPA values, and to compare these values between normal and glaucoma patients.
Methods	40 adult healthy volunteers (group1: G1) and 42 glaucoma patients (group2: G2) underwent prospectively consecutive 4 ORA, 3 OPA and 2 GAT measurements. Patients with previous refractive or intra-ocular surgery, contact lenses were excluded for both groups. Also, patients with ocular eye disease, topical or general medications were excluded for G1. For each device, the mean of the measurements for one randomised eye in G1 and for the more affected eye in G2 was used for statistical analysis. Pearson correlations were used. Comparisons of the two groups mean values were made with a two-tailed Student’s t test.
Results	82 eyes of 82 patients. The mean age for G1 and G2 was respectively: 43.6±14.6 and 65,1±13,6 years. The mean IOP was higher in G2 ( p <0.001) with the 3 devices. CH ( p <0.001) and CRF ( p= 0,028) values were lower in G2. OPA was higher in G2 ( p =0,014). The OPA/CH and OPA/CRF Pearson correlations were respectively: r=0,079, p =0,627 and r=0,258, p =0,108 for G1, and r=-0,116 p =0,463 and r=0,180 p =0,253 for G2.
Conclusion	We did not find any statistical significant correlation between corneal biomechanical properties and the OPA values either in normal or in glaucoma group. We found lower corneal biomechanical properties in glaucoma than in normal group.

Author 1

Last name	EHONGO
Initials	A
Department	HÔPITAL ERASME
City	Bruxelles

Author 2

Last name	DE MAERTELAER
Initials	V
Department	BIOSTATISTIQUES, HÔPITAL ERASME
City	Bruxelles

Author 3

Last name	COLLIGNON
Initials	N
Department	U.L.g
City	Liège

Author 4

Last name	POURJAVAN
Initials	S
Department	HÔPITAL St-Luc
City	Bruxelles