Background/aims: The accuracy of pattern deviation (PD) in estimating the damage to the glaucomatous visual field (VF) in the central 10° in eyes with glaucoma and cataract is unclear.
Methods: This retrospective study includes 63 eyes of 52 glaucoma patients who successfully underwent cataract surgery or cataract surgery plus iStent implantation. Using the Humphrey Field Analyser 10-2 test, VF was measured within 6 months preoperatively and postoperatively (VF and VF, respectively). The mean total deviation values in VF (mTD) indicates glaucomatous damage without cataract and the difference between this value and mean PD values in VF (mPD) was evaluated (εmPD). The effect of cataract was then evaluated as the difference between mTD and mTD (ΔmTD), while the effects of mTD and ΔmTD on εmPD were also assessed. In addition, based on preoperative visual acuity (VA) and VF, the optimal model for predicting mTD was identified. The error of this method (εOptimalModel) was estimated as the difference against mTD, which was compared with εmPD.
Results: Compared with mTD, there was a significant improvement in mTD (p=0.028). A significant difference was observed between mPD and mTD (p<0.001). Further, εmPD significantly increased with the increase of mTD or ΔmTD (p<0.001 and p=0.0444, respectively). The absolute εOptimalModel was significantly smaller than the absolute εmPD (p<0.001).
Conclusions: This study warns clinicians that PD of the central 10° VF might underestimate the glaucomatous VF damage with the progression of glaucoma and overestimate it as a cataract progresses.
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