Effect of light scatter on the pattern reversal visual evoked response: Comparison with psychophysical results

Tetsuka, Hitomi; Katsumi, Osamu; Morandi, Anthony J.; Tetsuka, Soichi; Wang, Guangji; Hirose, Tatsuo

doi:10.1016/0042-6989(92)90215-5

Cited by 6 publications

(9 citation statements)

References 17 publications

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“…Hurst and Douthwaite (1993) reviewed the clinical application of different visual examinations and stated that the flash and pattern ERG amplitudes were reduced in cataract; our study also supports this proposition. In our study, the CSF result was similar to that of Tetsuka et al . (1992) and it also showed that the LCD could produce a good approximation of posterior subcapsular cataract in a `real' eye (Elliott et al ., 1989).…”

Section: Discussionsupporting

confidence: 92%

“…The light scattering condition in this study was induced by LCD filter but in the studies of Arai et al . (1999) and Tetsuka et al . (1992), translucent acrylic sheets were used to induce the light scattering.…”

Section: Discussionmentioning

confidence: 97%

“…A few studies attempted to characterise the visual electrophysiological responses behind optical opacities. For example, Tetsuka et al . (1992) used translucent acrylic sheets to induce the light scattering and demonstrated that the pattern visual evoked potentials (PVEP) were reduced under the light scattering condition.…”

Section: Introductionmentioning

confidence: 99%

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The effect of light scattering on multifocal electroretinography

Chan

Siu

Yap

et al. 2002

Ophthalmic Physiologic Optic

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Section: Discussionsupporting

confidence: 92%

Section: Discussionmentioning

confidence: 97%

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The effect of light scattering on multifocal electroretinography

Chan

Siu

Yap

et al. 2002

Ophthalmic Physiologic Optic

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“…The mean P° was lower than the SA by 0.35 octave, which may be due to the fact that the cataract causes loss of contrast due to light scatter, thus affecting the smaller check sizes more than the larger check sizes, resulting in a better SA acuity. Tetsuka et al [32] investigated the effect of artificially induced light scatter on the PVER and found that its effect is most marked in the small check sizes. Although it is not within the scope of this study, measuring vision with optotypes of different contrasts will be helpful in the evaluation of visual dysfunction in ear ly cataract patients.…”

Section: Discussionmentioning

confidence: 99%

Snellen Visual Acuity versus Pattern Reversal Visual-Evoked Response Acuity in Clinical Applications

Ohn

Katsumi²,

Matsui³

et al. 1994

Ophthalmic Res

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We compared the best-corrected Snellen acuity (SA) and the pattern reversal visual-evoked response (PVER) acuity in normal subjects and patients. Forty-two eyes of 42 normal subjects were controls; 457 eyes of 329 patients comprised the patient group. A steady-state stimulus with five check sizes ranging from 160 to 10 min in 1.0-octave steps was used. The PVER acuity was derived from the best-fit linear function relating the amplitude to the log-adjusted check size. Three intercepts of 0, 1 and 2 μV were used in both groups, and the PVER acuities were called P°, P¹ and P². The SAs in normal subjects ranged from 20/15 to 20/20 (mean, 20/18.3) and in patients from 20/15 to 20/1,600 (mean, 20/56.9). In normals, the P° showed the best agreement with the SA (mean acuity difference, +0.34 octave). The SA and P° agreed within ± 2.0 octaves in 33/42 (78.6%) eyes. In patients, the P° also showed the best agreement with the SA; 306/457 (67.0%) eyes showed an acuity difference within ± 2.0 octaves. Unlike normals, 83/ 457 (18.2%) eyes showed an acuity difference > -3.0 octaves. These eyes mostly had optic nerve disease with a flattened PVER amplitude-check size function curve. The P° seems to correlate better with SA than P¹ and P², but this analytical method may be less effective in the presence of certain pathologic conditions.

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“…Therefore other tests with different principles are developed to measure straylight, for example, a direct compensating test 1 and a comparing compensating test 10 . Also electrophysiological measurements with the VEP (visual evoked potential) method are used to evaluate the effect of straylight on visual functions 11,12 . Advantages of electrophysical methods are that these methods are objective and conclusions can be done analyzed two parameters of the recorded curve: latency and amplitude.…”

Section: Introductionmentioning

confidence: 99%

<title>Factors affecting intraocular light scattering from different color straylight sources</title>

Ikaunieks

Ozolinsh

2008

SPIE Proceedings

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Important optical parameter of the eye is intraocular light scattering. Straylight can reduce visual acuity, contrast sensitivity. It is one of the main factors for glare, especially for drivers at night, when there is light source some distance away from the fixation point. There are many factors, which can affect amount of light scattering in the eye. To assess the effect of the color of the straylight source on retinal image quality at different light scattering levels, retinal straylight was measured with and without light scattering occluder. Red, green and blue colors were choosed for straylight source. Psychophysical and electrophysiological methods were used to evaluate light scattering effect on perception on different color stimuli. Results show that straylight values are the greatest for blue color with and without light scattering occluder. In measurements without light scattering occluder ratio of straylight values for red and green color are different between subjects. Using light scattering occluder straylight values for green color are greater than for red color. Optical and anatomical factors which can induce these spectral variations are discussed. Psychophysical and electrophysiological methods showed the similar changes in results with straylight values when light scattering were increased.

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Effect of light scatter on the pattern reversal visual evoked response: Comparison with psychophysical results

Cited by 6 publications

References 17 publications

The effect of light scattering on multifocal electroretinography

The effect of light scattering on multifocal electroretinography

Snellen Visual Acuity versus Pattern Reversal Visual-Evoked Response Acuity in Clinical Applications

<title>Factors affecting intraocular light scattering from different color straylight sources</title>

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