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Original article

Effects of blur on Humphrey 24-2 results


Henrietta L. Holmes-Smith ,

Orthoptic Department, Bournemouth Eye Unit, The Royal Bournemouth Hospital, Castle Lane East, Bournemouth, Dorset, BH7 7DW, GB
About Henrietta L.

BMedSci (Hons)

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Alison Y. Firth

Academic Unit of Ophthalmology and Orthoptics, University of Sheffield, Sheffield, GB
About Alison Y.


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Aim: To determine the effects of defocus on the retinal sensitivity within the central 2° and at 24° of the visual field and to compare the effect on the two areas.

Methods: Twelve normal subjects (aged 18–22 years) undertook three visual field tests on a Humphrey visual field analyser, one with a +3.00 DS lens, one with a +4.00 DS and one with a +5.00 DS. Mean threshold sensitivity was recorded in the central 2° and at 24°. Analysis of variance and paired t-tests were used for data analysis.

Results: Two participants were excluded. Analysis of the 10 remaining participants showed that the strength of lens used affected sensitivity (p < 0.0013), the difference Occurring when the +5.00 DS lens was used. Each lens had a similar effect on the central 2° and at 24° (p = 0.6706).

Conclusion: Threshold sensitivity was reduced with induced blur from plus lenses, without cycloplegia.
How to Cite: Holmes-Smith, H.L. and Firth, A.Y., 2006. Effects of blur on Humphrey 24-2 results. British and Irish Orthoptic Journal, 3, pp.17–20. DOI:
Published on 01 Jan 2006.
Peer Reviewed


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