Abstract:

Objective   To compare ocular response analyzer（ORA）, goldmann applanation tonometer（GAT）and non-contact tonometer （NCT）in the intraocular pressure measurement. Methods   The patients were recruited as the normal group(168 eyes), the glaucoma group(62 eyes) and the post-refractive-surgery group (102 eyes). The intraocular pressure and the central corneal thickness(CCT) of all patients were measured by ORA and A-type ultra-sonography. The intraocular pressure of the normal group and the post-refractive-surgery group was measured by NCT  and GAT in the glaucoma group. Results   In the normal group and the post-refractive-surgery group, NCT value was (17.44±3.53) mmHg and (13.91±4.99) mmHg respectively. In the glaucoma group, GAT value was (18.90±3.74) mmHg. In all three groups, ORA values were(18.33±4.00) mmHg, ( 19.91±4.44) mmHg and (16.69±5.24) mmHg）respectively. ORA values were higher than NCT or GAT value in all groups. There were medium-level correlations between CCT value and NCT value in normal group and post-refractive-surgery group(r=0.466,0.472).There was a medium-level correlation between CCT values and GAT value in the glaucoma group (r=0.434).There was a low-level correlation between CCT value and ORA value in all groups(r=0.258, 0.221,0.249). Conclusion   Compared with the goldmann applanation tonometer and non-contact tonometer, ORA can provide more accurate  IOP value and be less influenced by corneal factors.

Key words: Ocular response analyzer; Intraocular pressure; Goldmann applanation tonometer; Non-contact tonometer; Central corneal thickness