Contrast sensitivity in eyes with central scotoma: effect of stimulus drift

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Contrast sensitivity in eyes with central scotoma : effect of stimulus drift

Lewis, Peter, 1971- (författare): Linnéuniversitetet,Institutionen för medicin och optometri (MEO),Linnaeus Univ, Dept Med & Optometry, Kalmar, Sweden.

Venkataraman, Abinaya Priya, 1985- (författare): KTH,Tillämpad fysik,KTH Royal institute of technology, Sweden

Lundström, Linda (författare): KTH,Tillämpad fysik,KTH Royal institute of technology, Sweden

(creator_code:org_t)

Wolters Kluwer, 2018
2018
Engelska.
Ingår i: Optometry and Vision Science. - : Wolters Kluwer. - 1040-5488 .- 1538-9235. ; 95:4, s. 354-361

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Tidskriftsartikel (refereegranskat)

Abstract Ämnesord

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SignificanceIn the field of visual rehabilitation of patients with central visual field loss, knowledge on how peripheral visual function can be improved is essential. This study presents measurements of peripheral dynamic contrast sensitivity (with optical correction) for off-axis viewing angles in subjects with central visual field loss.PurposeSubjects with central visual field loss (CFL) rely on a peripheral preferred retinal locus (PRL) for many visual tasks. It is therefore important to ascertain that contrast sensitivity (CS) is maximized in the PRL. This study evaluates the effect of stimulus motion, in combination with optical correction, on CS in subjects with CFL.MethodsThe off-axis refractive errors in the PRL of five young CFL subjects were measured with a COAS open-view Hartmann-Shack aberrometer. Low-contrast (25% and 10%) and high-contrast resolution acuity for stationary gratings was assessed with and without optical correction. High-contrast resolution was also measured for gratings drifting at 7.5 Hz (within a fixed Gaussian window). Furthermore, resolution CS was evaluated for both stationary and moving gratings with optical correction for a total of 2-3 spatial frequencies per subject.ResultsHigh-contrast resolution acuity was relatively insensitive to stimulus drift motion of 7.5 Hz, whereas CS for gratings of 0.5 cycles per degree improved with drift for all subjects. Furthermore, both high- and low-contrast static resolution improved with optical correction.Conclusions Just as for heathy eyes, stimulus motion of 7.5 Hz enhances CS for gratings of low spatial frequency also in the PRL of eyes with CFL. Concurrently, high contrast resolution is unaffected by the 7.5 Hz drift, but improves with off-axis optical correction. This highlights the importance of providing optimal refractive correction for subjects with CFL, and that stimulus motion can be used to further enhance CS at low spatial frequencies.

Ämnesord

MEDICIN OCH HÄLSOVETENSKAP -- Annan medicin och hälsovetenskap -- Övrig annan medicin och hälsovetenskap (hsv//swe)
MEDICAL AND HEALTH SCIENCES -- Other Medical and Health Sciences -- Other Medical and Health Sciences not elsewhere specified (hsv//eng)
MEDICIN OCH HÄLSOVETENSKAP -- Klinisk medicin -- Oftalmologi (hsv//swe)
MEDICAL AND HEALTH SCIENCES -- Clinical Medicine -- Ophthalmology (hsv//eng)

Nyckelord

Central scotoma
Central visual field loss
Contrast sensitivity
Off-axis refractive errors
Peripheral vision
Spatiotemporal contrast sensitivity
Stimulus drift
Preferred retinal locus
Optometry
Optometri

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Av lärosätet: Linnéuniversitetet; Kungliga Tekniska Högskolan

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