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Evidence for a learning effect in short-wavelength automated perimetry.
Ophthalmology. 2006 Feb; 113(2):206-15.O

Abstract

PURPOSE

To document the magnitude of any learning effect for short-wavelength 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 twofold 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.

Authors+Show Affiliations

Cardiff School of Optometry and Vision Sciences, Cardiff University, Cardiff, United Kingdom. wildjm@cardiff.ac.ukNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

16458091

Citation

Wild, John M., et al. "Evidence for a Learning Effect in Short-wavelength Automated Perimetry." Ophthalmology, vol. 113, no. 2, 2006, pp. 206-15.
Wild JM, Kim LS, Pacey IE, et al. Evidence for a learning effect in short-wavelength automated perimetry. Ophthalmology. 2006;113(2):206-15.
Wild, J. M., Kim, L. S., Pacey, I. E., & Cunliffe, I. A. (2006). Evidence for a learning effect in short-wavelength automated perimetry. Ophthalmology, 113(2), 206-15.
Wild JM, et al. Evidence for a Learning Effect in Short-wavelength Automated Perimetry. Ophthalmology. 2006;113(2):206-15. PubMed PMID: 16458091.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Evidence for a learning effect in short-wavelength automated perimetry. AU - Wild,John M, AU - Kim,Linda S, AU - Pacey,Ian E, AU - Cunliffe,Ian A, PY - 2005/02/09/received PY - 2005/10/20/revised PY - 2005/10/26/accepted PY - 2006/2/7/pubmed PY - 2006/2/16/medline PY - 2006/2/7/entrez SP - 206 EP - 15 JF - Ophthalmology JO - Ophthalmology VL - 113 IS - 2 N2 - PURPOSE: To document the magnitude of any learning effect for short-wavelength 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 twofold 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. SN - 1549-4713 UR - https://www.unboundmedicine.com/medline/citation/16458091/Evidence_for_a_learning_effect_in_short_wavelength_automated_perimetry_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0161-6420(05)01298-4 DB - PRIME DP - Unbound Medicine ER -