Intraocular pressure measurement in patients with previous LASIK surgery using pressure phosphene tonometer.
OBJECTIVE
To compare intraocular pressure (IOP) assessment in post-LASIK patients using non-contact tonometry, pressure phosphene tonometry and applanation tonometry.


METHODS
Sixty-two consecutive LASIK patients were analysed preoperatively and postoperatively with non-contact, pressure phosphene and applanation tonometry. Comparisons among these values were assessed with paired sample Student t-test, Pearson's correlation test and Bland-Altman plotting.


RESULTS
There was no significant difference for preoperative IOP measurement between non-contact, pressure phosphene and applanation tonometry. The mean +/-SD difference between the preoperative non-contact tonometry and postoperative pressure phosphene tonometry IOP measurements was 0.80 +/- 2.77 mmHg (P < 0.01). Postoperative applanation tonometry significantly underestimated IOP measurement by 5.45 +/- 2.96 mmHg (P < 0.001) and postoperative non-contact tonometry significantly underestimated IOP measurement by 9.96 +/- 2.25 mmHg (P < 0.001).


CONCLUSIONS
Pressure phosphene tonometry may provide an alternative method for the assessment of IOP in post-LASIK patients.
Cheng
Arthur C K
AC
Department of Ophthalmology and Visual Sciences, The Chinese University of Hong Kong, University Eye Center, Hong Kong Eye Hospital, Hong Kong, China.
Leung
Dexter Y L
DY
Cheung
Eva Y Y
EY
Fan
Dorothy S P
DS
Law
Ricky W K
RW
Lam
Dennis S C
DS
D000328:Adult; D006801:Humans; D007429:Intraocular Pressure / Q000502:physiology*; D020731:Keratomileusis, Laser In Situ; D008875:Middle Aged; D009216:Myopia / Q000601:surgery*; D010719:Phosphenes; D011184:Postoperative Period; D014065:Tonometry, Ocular / Q000295:instrumentation / Q000379:methods*