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New perimetric techniques: a comparison between rarebit and frequency doubling technology perimetry in normal
1Department of Clinical Science, Karolinska Institutet, Stockholm, Sweden. Lene.Martin@ste.ki.se
Purpose:
To compare rarebit microdot perimetry (RB) with frequency doubling technology (FDT) perimetry in normal subjects and a group of patients with ocular hypertension or glaucoma, with age-matched controls.
Materials And Methods:
: Eighty-one subjects (age 17-88 years) were examined. Twenty-seven of these were patients, aged 50 to 88 years, with ocular hypertension or suspected/manifest glaucoma in at least one eye. All subjects were examined with the RB and FDT perimetry, using the standard procedures, recommended by the respective manufacturer.
Results:
All patients were able to perform the RB perimetry, but three patients could not perceive the strongest FDT stimulus. The concordance in RB and FDT classifications as normal/outside normal limits was 96% (Cohen's kappa = 0.90). A curvilinear (quadratic) relationship (Rsq = 0.75) was found between RB hit rate and FDT MD. All patients, who could perform both examinations, preferred the RB perimetry.
Conclusion:
In the current study, the information from the RB and FDT perimetry was almost completely equivalent. However, RB perimetry was preferred by the patients and seemed to have a larger dynamic range than FDT. The RB hit rate is apparently a straightforward and efficient measure of visual field function.
