Practical recommendations for measuring rates of visual field change in glaucoma.

Practical recommendations for measuring rates of visual field change in glaucoma. Research Abstract Details 

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Practical recommendations for measuring rates of visual field change in glaucoma. Abstract Text:

B C Chauhan,D F Garway-Heath,F J ,L Rossetti,B Bengtsson,A C Viswanathan,A Heijl,B C Chauhan,D F Garway-Heath,F J ,L Rossetti,B Bengtsson,A C Viswanathan,A Heijl,

To date, there has been a lack of evidence-based guidance on the frequency of visual field examinations required to identify clinically meaningful rates of change in glaucoma. The objective of this perspective is to provide practical recommendations for this purpose. The primary emphasis is on the period of time and number of examinations required to measure various rates of change in mean deviation (MD) with adequate statistical power. Empirical data were used to obtain variability estimates of MD while statistical modelling techniques derived the required time periods to detect change with various degrees of visual field variability. We provide the frequency of examinations per year required to detect different amounts of change in 2, 3 and 5 years. For instance, three examinations per year are required to identify an overall change in MD of 4 dB over 2 years in a patient with average visual field variability. Recommendations on other issues such as examination type, strategy and quality are also made.

Practical recommendations for measuring rates of visual field change in glaucoma. Publishing Authors By Initials

BC Chauhan,DF Garway-Heath,FJ ,L Rossetti,B Bengtsson,AC Viswanathan,A Heijl,BC Chauhan,DF Garway-Heath,FJ ,L Rossetti,B Bengtsson,AC Viswanathan,A Heijl,

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Practical recommendations for measuring rates of visual field change in glaucoma. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: The British journal of ophthalmology

VOLUME: 92

Page Numbers: 569-73

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ISSN: 1468-2079

DAY: 22

MONTH: 01

YEAR: 2008

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LANGUAGE: eng

NlmUniqueID: 421041

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AFFILIATION: Department of Ophthalmology and Visual Sciences, Dalhousie University, 2nd Floor Centennial Building, Queen Elizabeth II Health Sciences Centre, Halifax, Canada B3H 2Y9; bal@dal.ca.

Country: England

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MEDLINETA: Br J Ophthalmol

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