[Should measurement of ocular tonus be repeated? Statistical analysis of 64 measurement in 25 patients].
OBJECTIVE
This study aimed to determine usefulness of repeating tonometry and averaging of the results in order to increase precision.


METHODS
Variance analysis was performed, the intra class correlation coefficient was calculated to determine the confidence intervals (95%) for averaging with two or more results.


RESULTS
For one measurement the confidence interval was 7.07 mmHg, for 2 measurement, it was 5.00 mmHg and for 3 measurement 4.08 mmHg. For more measurements, there was little more improvement in precision.


CONCLUSIONS
We therefore recommend to perform the tonometry twice, averaging the 2 results, in order to increase the precision of the final result. If more precision is required a third measurement and averaging of the 3 results can be made. Although it was proven that the influence of carefully repeated aplanation tonometry is not significant on the resultats for 2 or 3 measurements, averaging could be done during a single consultation.
Desmettre
T
T
Service d'Ophtalmologie, Hôpital Huriez, CHRU, Lille.
Labalette
P
P
Paul
P
P
Rouland
J F
JF
D000328:Adult; D000368:Aged; D000704:Analysis of Variance; D006801:Humans; D008875:Middle Aged; D015203:Reproducibility of Results; D014065:Tonometry, Ocular
Faut-il répéter la mesure du tonus oculaire? Analyse statistique de 64 mesures chez 25 patients.