Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/16489
Title: The usefulness of waveform score from the ocular response analyzer
Authors: Lam, AKC 
Chen, D
Tse, J
Keywords: Corneal hysteresis
Corneal resistance factor
Intraocular pressure
Ocular response analyzer
Issue Date: 2010
Publisher: Lippincott Williams & Wilkins
Source: Optometry and vision science, 2010, v. 87, no. 3, p. 195-199 How to cite?
Journal: Optometry and vision science 
Abstract: Purpose. To study the usefulness of the Waveform Score from the ocular response analyzer (ORA). Methods. Both eyes of sixty-four normal Chinese adults were measured by the ORA. An experienced practitioner who was masked to the score evaluated the waveforms. Four measurements were obtained from each eye, and the average was considered as the gold standard. Agreement was compared for the mean of different multiple measurements to the gold standard. Results. There was no significant difference between the gold standard and the mean of different multiple measurements for all ORA parameters. The Waveform Score of 512 signals (four measurements from each eye of 64 subjects) ranged from 1.58 to 9.06. When the best signal value of four measured signals from each eye was considered, the lowest score was 3.60 from 128 eyes. The lower 10th percentile from all signals had Waveform Scores <3.48. Conclusions. If the Waveform Score provides information on the reliability of the signals, a score <3.50 may indicate an unreliable signal, and the signal should be discarded. We also recommend taking three measurements with all the signals having a Waveform Score of 3.50 or above to increase the precision.
URI: http://hdl.handle.net/10397/16489
ISSN: 1040-5488
EISSN: 1538-9235
DOI: 10.1097/OPX.0b013e3181d1d940
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