Reliability of intraocular pressure measurements after myopic excimer photorefractive keratectomy

Ophthalmology. 1998 Dec;105(12):2193-6. doi: 10.1016/S0161-6420(98)91215-5.


Objective: To determine the reliability of intraocular pressure (IOP) measurements by Goldmann applanation tonometry and pneumotonometry in eyes treated with excimer myopic photorefractive keratectomy (PRK).

Design: A prospective case series.

Participants: Forty consecutive eyes treated with PRK were evaluated.

Intervention and main outcome measures: Central and peripheral corneal Goldmann tonometry and pneumotonometry measurements were done before surgery, at 1 week, and at 1 and 3 months after surgery.

Results: The IOP by Goldmann tonometry from the central cornea was significantly lower than the peripheral IOP; however, there was no difference between IOP measured from central and peripheral corneas by pneumotonometry, which, in turn, correlated with peripheral Goldmann measurements. There was a trend, but not a statistically significant correlation, between the spherical equivalent of the treatment and the amount of decrease in central Goldmann IOP.

Conclusions: Pneumotonometry measures the IOP reliably after PRK from all parts of the cornea, whereas central Goldmann tonometry underestimates the IOP by 2.40+/-1.23 mmHg.

Publication types

  • Comparative Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Administration, Topical
  • Adult
  • Aged
  • Aged, 80 and over
  • Anti-Inflammatory Agents / administration & dosage
  • Cornea / surgery*
  • Female
  • Glucocorticoids
  • Humans
  • Intraocular Pressure* / drug effects
  • Lasers, Excimer
  • Male
  • Middle Aged
  • Myopia / surgery*
  • Photorefractive Keratectomy*
  • Prospective Studies
  • Reproducibility of Results
  • Tonometry, Ocular / instrumentation
  • Tonometry, Ocular / standards*


  • Anti-Inflammatory Agents
  • Glucocorticoids