The impact of intraocular pressure reduction on retinal ganglion cell function measured using pattern electroretinogram in eyes receiving latanoprost 0.005% versus placebo

Mitra Sehi, Dilraj S. Grewal, William J. Feuer, David S. Greenfield

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Purpose: To evaluate the impact of intraocular (IOP) reduction on retinal ganglion cell (RGC) function measured using pattern electroretinogram optimized for glaucoma (PERGLA) in glaucoma suspect and glaucomatous eyes receiving latanoprost 0.005% versus placebo. Methods: This was a prospective, placebo-controlled, double masked, cross-over clinical trial. One randomly selected eye of each subject meeting eligibility criteria was enrolled. At each visit, subjects underwent five diurnal measurements between 8:00. am and 4:00. pm consisting of Goldmann IOP, and PERGLA measurements. A baseline examination was performed following a 4-week washout period, and repeat examination after randomly receiving latanoprost or placebo for 4-weeks. Subjects were then crossed over to receive the alternative therapy for 4. weeks following a second washout period, and underwent repeat examination. Linear mixed-effect models were used for the analysis. Results: Sixty-eight eyes (35 glaucoma, 33 glaucoma suspect) of 68 patients (mean age 67.4 ± 10.6. years) were enrolled. The mean IOP (mm. Hg) after latanoprost 0.005% therapy (14.9 ± 3.8) was significantly lower than baseline (18.8 ± 4.7, p<0.001) or placebo (18.0 ± 4.3), with a mean reduction of -20 ± 13%. Mean PERGLA amplitude (μV) and phase (π-radian) using latanoprost (0.49 ± 0.22 and 1.71 ± 0.22, respectively) were similar (p>0.05) to baseline (0.49 ± 0.24 and 1.69 ± 0.19) and placebo (0.50 ± 0.24 and 1.72 ± 0.23). No significant (p>0.05) diurnal variation in PERGLA amplitude was observed at baseline, or using latanoprost or placebo. Treatment with latanoprost, time of day, and IOP were not significantly (p>0.05) associated with PERGLA amplitude or phase. Conclusion: Twenty percent IOP reduction using latanoprost monotherapy is not associated with improvement in RGC function measured with PERGLA.

Original languageEnglish (US)
Pages (from-to)235-242
Number of pages8
JournalVision Research
Volume51
Issue number2
DOIs
StatePublished - Jan 28 2011

Keywords

  • Glaucoma
  • Intraocular pressure
  • Latanoprost
  • Pattern electroretinogram
  • Retinal ganglion cell

ASJC Scopus subject areas

  • Ophthalmology
  • Sensory Systems

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