title: The effect of myopic optical defocus on the humphrey matrix 30-2 threshold test.
abstract: OBJECTIVE
  To examine the effect of the myopic optical defocus on the Humphrey Matrix 30-2 test.
  
  
  METHODS
  Prospective, nonrandomized, comparative case series.
  
  
  METHODS
  Forty eyes from 40 patients with and without glaucoma underwent 2 consecutive tests using the Humphrey Matrix 30-2 threshold program. The first and second tests were performed with and without a correction of myopia. All the eyes studied were divided into low-myopic [spherical equivalent (SE) < or = -3.0 diopter] and moderate-myopic groups. The difference in the mean deviation (DeltaMD) was calculated. The correlation between the SE and DeltaMD was examined. The influence of optical defocus on the total deviation and pattern deviation plot change according to the severity of glaucomatous visual field damage was also evaluated.
  
  
  RESULTS
  The DeltaMD between the 2 tests was statistically significant in both the low-myopic (P<0.01) and moderate-myopic (P<0.01) groups. The correlation between SE and DeltaMD was significant in the moderate-myopic group (P=0.03). The correlation was less significant, however, in the low-myopic group (P=0.07). In the moderate-myopic group, a less damaged visual field was more susceptible to the myopic optical defocus (P<0.01).
  
  
  CONCLUSIONS
  Myopic optical defocus has a significant effect on the Humphrey Matrix 30-2 test results, even in the low-myopic eyes.
authors: Department of Ophthalmology, Samsung Medical Center, Sungkyunkwan University School of Medicine, #50 Ilwon-dong, Seoul, Republic of Korea.
authors: Jae Hui
authors: JH
authors: Kim
authors: Changwon
authors: C
authors: Kee
mesh_terms: D000328:Adult; D005403:Fixation, Ocular; D005901:Glaucoma / Q000150:complications* / Q000503:physiopathology*; D006801:Humans; D008875:Middle Aged; D009216:Myopia / Q000150:complications* / Q000503:physiopathology*; D011446:Prospective Studies; D012720:Severity of Illness Index; D058609:Visual Field Tests / Q000379:methods*; D014794:Visual Fields