Vision under mesopic and scotopic illumination

Zele, Andrew J.; Cao, Dingcai

doi:10.3389/fpsyg.2014.01594

Cited by 142 publications

(133 citation statements)

References 193 publications

(333 reference statements)

Supporting

Mentioning

124

Contrasting

Unclassified

Order By: Relevance

“…2c). However, since human vision CS is reduced in the dark [22, 23, 24, 25], our app’s reduced CS measuring range for PP condition may not be a limitation, as long as it covers the expected human CS performance in the PP. Indeed as shown in our preliminary data (see the performance validation section below) normal vision subjects cannot even reach 1.30 LogCS in PP CS measures.…”

Section: Implementing Cs Measuring Appmentioning

confidence: 99%

See 1 more Smart Citation

Positive and negative polarity contrast sensitivity measuring app

Hwang

Peli

2016

View full text Add to dashboard Cite

Contrast sensitivity (CS) quantifies an observer’s ability to detect the smallest (threshold) luminance difference between a target and its surrounding. In clinical settings, printed letter contrast charts are commonly used, and the contrast of the letter stimuli is specified by the Weber contrast definition. Those paper-printed charts use negative polarity contrast (NP, dark letters on bright background) and are not available with positive polarity contrast (PP, bright letters on dark background), as needed in a number of applications. We implemented a mobile CS measuring app supporting both NP and PP contrast stimuli that mimic the paper charts for NP. A novel modified Weber definition was developed to specify the contrast of PP letters. The validity of the app is established in comparison with the paper chart. We found that our app generates more accurate and a wider range of contrast stimuli than the paper chart (especially at the critical high CS, low contrast range), and found a clear difference between NP and PP CS measures (CSNP>CSPP) despite the symmetry afforded by the modified Weber contrast definition. Our app provides a convenient way to measure CS in both lighted and dark environments.

show abstract

Section: Implementing Cs Measuring Appmentioning

confidence: 99%

“…The slight changes of the hues accompanied by such a small single channel luminance changes are not perceptible, especially under very low light levels. At such lighting conditions, signal from the rods dominate light perception, and they modulates color signal carried by cones [24]. …”

Section: Implementing Cs Measuring Appmentioning

confidence: 99%

Positive and negative polarity contrast sensitivity measuring app

Hwang

Peli

2016

View full text Add to dashboard Cite

show abstract

“…Mesopic vision is a wide intermediate stage between pure rod or scotopic vision and pure cone or photopic vision (Narisada and Schreuder 2004;Stockman and Sharpe 2006;Zele and Cao 2014). It, approximately, ranges from starlight to twilight (Stockman and Sharpe 2006), and is present in many indoor environments, including the majority of Human Neuroscience laboratories.…”

Section: Introductionmentioning

confidence: 99%

Ambient Light Modulation of Exogenous Attention to Threat

Carretié

Ruiz-Padial

2016

Brain Topogr

View full text Add to dashboard Cite

Esta es la versión de autor del artículo publicado en: This is an author produced version of a paper published in: El acceso a la versión del editor puede requerir la suscripción del recurso Access to the published version may require subscription AcknowledgementsThis research was supported by the grants PSI2014-54853-P and PSI2012-37090 from the Ministerio de Economía y Competitividad of Spain (MINECO).2 Abstract Planet Earth's motion yields a 50% day -50% night yearly balance in every latitude or longitude, so survival must be guaranteed in very different light conditions in many species, including human. Cone-and rod-dominant vision, respectively specialized in light and darkness, present several processing differences, which are-at least partiallyreflected in event-related potentials (ERPs). The present experiment aimed at characterizing exogenous attention to threatening (spiders) and neutral (wheels) distractors in two environmental light conditions, low mesopic (L, 0.03 lux) and high mesopic (H, 6.5 lux), yielding a differential photoreceptor activity balance: rod>cone and rod

show abstract

“…[1][2][3] 강한 빛을 가까운 거리에서 보게 되는 경우 에는 매우 큰 광량이 일시적으로 망막의 영상면에 집속되어 시력에 영향을 미칠 수 있으며 더욱이 눈의 동공의 직경이 낮에는 2 mm에서 캄캄하게 어두운 밤에는 8 mm까지 커지 는 것을 [4,5] 고려하면 야간에 사용되는 고섬광을 가까운 거리 에서 바라보게 되는 상황은 시력에 매우 심각한 영향을 미칠 수 있다. [4][5][6] [2,3] , 개략적으로라도 섬광 의 적외선 발광 특성도 측정할 수 있었다. [6,7] 또한 최근의 연 구에서 섬광의 발광 특성, 섬광에 노출되는 거리, 그리고 주 변 환경의 조도에 따른 망막에 도달되는 복사조도(irradiance) 와 총 입사에너지를 모델링하였다.…”

Section: 서 론unclassified

Exposure-Limit Distance as a Safety-Indicating Parameter of a High-Intensity Flash Source

Park¹,

Kim²

2017

Korean Journal of Optics and Photonics

View full text Add to dashboard Cite

A systematic understanding of the effects of high-intensity flash sources on the human eye is strongly needed, not only for proper use of the sources, but for human eye health. In this study, the exposure-limit distance (ELD), indicating the minimal safe distance in case of seeing by chance a high-intensity flash, is proposed. The optical procedures to determine the ELD of a high-intensity flash are clarified, and the dependence of ELD on its parameters such as luminous intensity, duration, and radius of a flash are thoroughly investigated. From this investigation it is obvious that, while being weakly dependent on duration, the ELD is nearly proportional to the luminous intensity and the radius of a flash. The proposed ELD as an intuitive safety-indicating parameter is more useful and intuitive than the other characteristic parameters of a high-intensity flash. The ELD is expected to be an essential parameter as a safety indicator, to characterize the performance of a high-intensity flash and to promote the safety of the human eye.

show abstract

Vision under mesopic and scotopic illumination

Cited by 142 publications

References 193 publications

Positive and negative polarity contrast sensitivity measuring app

Positive and negative polarity contrast sensitivity measuring app

Ambient Light Modulation of Exogenous Attention to Threat

Exposure-Limit Distance as a Safety-Indicating Parameter of a High-Intensity Flash Source

Contact Info

Product

Resources

About