Document Detail

A clinical evaluation of proview pressure phosphene tonometry in children.
MedLine Citation:
PMID:  17106408     Owner:  NLM     Status:  MEDLINE    
PURPOSE: The Proview tonometer measures intraocular pressure by inducing a pressure phosphene through the eyelid and, if reliable and valid, may offer a quick, nonthreatening and noninvasive alternative method of obtaining intraocular pressures (IOPs) without the use of eye drops. This study compares the IOP measurements obtained in children using Proview pressure phosphene tonometry (PPPT) and Goldmann tonometry (GT).
METHODS: One hundred four 5- to 12-year-old patients of the University Optometric Center/SUNY College of Optometry participated in the study. Subjects were randomized to receive, by different investigators, either PPPT or GT first. Two measurements with each instrument were attempted on each eye of all subjects. A subgroup of 41 subjects was asked which of the two methods was preferred.
RESULTS: Seven percent of the subjects did not report a pressure phosphene response compared with 12% of the subjects on whom the investigators were unable to perform GT. The remaining 85 subjects completed the subject protocol. Of the 41 subjects asked, 56% preferred PPPT, 24% had no preference, and 20% preferred GT. The coefficient of repeatability between the two readings was higher for PPPT (3-4 mm Hg) than for GT (1 mm Hg). Mean IOP was 4 mm Hg higher for PPPT than GT with the difference in readings between the two instruments increasing with higher IOPs (r >19%, p < 0.005).
CONCLUSIONS: In our study of healthy young subjects, PPPT measurements of IOP appear to be repeatable within a few millimeters of mercury in most children, but for some children, variability in repeat measurements can be substantial. Our data showed a mean difference in readings of 4 mm Hg with a 95% confidence interval that the PPPT reading was between 12 mm Hg above GT and 4 mm Hg below GT. This wide range of values indicates that PPPT is not comparable to GT. However, because our study found that children can appreciate pressure phosphenes and most prefer PPPT over GT, the Proview monitor may have value as a noninvasive, portable screener in pediatric patients. To fully evaluate this potential, further studies are needed that include patients with high IOPs.
Ida Chung; Amelia Bartolone; William H Swanson; Andrea P Thau
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Publication Detail:
Type:  Journal Article; Randomized Controlled Trial    
Journal Detail:
Title:  Optometry and vision science : official publication of the American Academy of Optometry     Volume:  83     ISSN:  1040-5488     ISO Abbreviation:  Optom Vis Sci     Publication Date:  2006 Nov 
Date Detail:
Created Date:  2006-11-19     Completed Date:  2007-01-04     Revised Date:  2014-09-15    
Medline Journal Info:
Nlm Unique ID:  8904931     Medline TA:  Optom Vis Sci     Country:  United States    
Other Details:
Languages:  eng     Pagination:  817-22     Citation Subset:  IM    
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MeSH Terms
Child, Preschool
Glaucoma / diagnosis,  physiopathology
Intraocular Pressure / physiology*
Reproducibility of Results
Tonometry, Ocular / methods*
Grant Support
R01 EY007716/EY/NEI NIH HHS; R01 EY007716-13/EY/NEI NIH HHS; R01 EY007716-14/EY/NEI NIH HHS; R01 EY007716-15/EY/NEI NIH HHS

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