短波长自动视野检查中学习因素对结果产生的影响程度

Evidence for a learning effect in short-wavel-ength automated perimetry

Purpose: To document the magnitude of any learning effect for short-wave length automated perimetry (SWAP) in patients with either ocular hypertension (OHT) or open-angle glaucoma (OAG) who are experienced in standard automated perimetry (SAP). Design: Experimental study. Participants: Thirty-five patients (22 with OHT and 13 with OAG) who had previously undergone at least 3 threshold SAP visual field examinations with the Humphrey Field Analyzer (HFA; Carl Zeiss Meditech Inc.,Dublin,CA),and 9 patients with OHT who had not previously undertaken any form of perimetry. Methods: Each patient attended for SWAP on 5 occasions,each separated by 1 week. At each visit,both eyes were examined using Program 24-2 of the HFA; the right eye was always examined before the left eye. Main Outcome Measures: (1) Change over the 5 examinations,in each eye,of the visual field indices Mean Deviation (MD),Short-term Fluctuation (SF),Pattern Standard Deviation (PSD),and Corrected Pattern Standard Deviation. (2) Change in each eye between Visits 1 and 5 in proportionate Mean Sensitivity (pMS) for the central annulus of stimulus locations compared with that for the peripheral annulus thereby determining the influence of stimulus eccentricity on any alteration in sensitivity. (3) Change between Visits 1 and 5 in the number and magnitude of the Pattern Deviation (PD) probability levels associated with any alteration in sensitivity. Results: The MD,SF,and PSD each improved over the 5 examinations (each at P< 0.001). The improvement in pMS between Visits 1 and 5 was greater for the peripheral annulus than for the central annulus by approximately two fold for the patients with OAG. Considerable variation was present between patients,within and between groups,in the number of locations exhibiting an improving sensitivity between Visits 1 and 5 by 1 or more PD probability levels. Conclusions: Care should be taken to ensure that,during the initial examinations,apparent field loss with SWAP in patients exhibiting a normal field by SAP is not the result of inexperience in SWAP. Apparently deeper or wider field loss in the initial examinations with SWAP compared with that exhibited by SAP in OAG also may arise from inexperience in SWAP.

Purpose： To document the magnitude of any learning effect for short-wave length automated perimetry （SWAP） in patients with either ocular hypertension （OHT） or open-angle glaucoma （OAG） who are experienced in standard automated perimetry （SAP） Design： Experimental study.Participants： Thirty-five patients （22 with OHT and 13 with OAG） who had previously undergone at least 3 threshold SAP visual field examinations with the Humphrey Field Analyzer （HFA; Carl Zeiss Meditech Inc., Dublin, CA）, and 9 patients with OHT who had riot previously undertaken any form of perimetry. Methods： Each patient attended for SWAP on 5 occasions, each separated by 1 week. At each visit, both eyes were examined using Program 24 - 2 of the HFA; the right eye was always examined before the left eye. Main Outcome Measures： （1） Change over the 5 examinations, in each eye, of the visual field indices Mean Deviation （MD）, Short-term Fluctuation （SF）, Pattern Standard Deviation （PSD）, and Corrected Pattern Standard Deviation. （2） Change in each eye between Visits 1 and 5 in proportionate Mean Sensitivity （pMS） for the central annulus of stimulus locations compared with that for the peripheral annulus thereby determining the influence of stimulus eccentricity on any alteration in sensitivity. （3） Change between Visits 1 and 5 in the number and magnitude of the Pattern Deviation （PD） probability levels associated with any alteration in sensitivity. Results： The MD, SF, and PSD each improved over the 5 examinations （each at P 〈 0. 001 ）.