Role of parafovea in blur perception

Radhakrishnan, A. (author)

Dorronsoro, C. (author)

Marcos, S. (author)

(creator_code:org_t)

Elsevier, 2017
2017
English.
In: Vision Research. - : Elsevier. - 0042-6989 .- 1878-5646. ; 138, s. 59-65

Related links:: https://doi.org/10.1...; show more...; https://urn.kb.se/re...; https://doi.org/10.1...; show less...

Abstract Subject headings

The blur experienced by our visual system is not uniform across the visual field. Additionally, lens designs with variable power profile such as contact lenses used in presbyopia correction and to control myopia progression create variable blur from the fovea to the periphery. The perceptual changes associated with varying blur profile across the visual field are unclear. We therefore measured the perceived neutral focus with images of different angular subtense (from 4° to 20°) and found that the amount of blur, for which focus is perceived as neutral, increases when the stimulus was extended to cover the parafovea. We also studied the changes in central perceived neutral focus after adaptation to images with similar magnitude of optical blur across the image or varying blur from center to the periphery. Altering the blur in the periphery had little or no effect on the shift of perceived neutral focus following adaptation to normal/blurred central images. These perceptual outcomes should be considered while designing bifocal optical solutions for myopia or presbyopia.

By the author/editor: Venkataraman, Ab ...; Radhakrishnan, A ...; Dorronsoro, C.; Lundström, Linda; Marcos, S.

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Other Physics To ...

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