Pupil Light Reflex Produced by Glare under Mesopic Adaptation

Influence of ophthalmic lenses in the illuminance originated at a peripheral glare source and reaching the eye

“…For example, a car headlight with a diameter of about 270 mm placed at 20 Â 10 3 mm and forming 101 with the direction in which the driver travels, gives rise to about 50 lx at the driver's eye. If distances were divided by a factor 27, the distance source-sensor would be 750 mm and the stop diameter 10 mm though the stop in our experimental setup is approximately twice as large as this and, as in previous articles [4,5], the illuminance E is 60 lx.…”

“…The distances g; B 0 and d gl are measured while B and y are calculated and, as in previous papers [4,5], y is approximately 101 ( lenses of up to 76 dioptres with an error which is at most 3%. Additionally, we obtain that, if D S ¼ 12 mm, a diverging ophthalmic lens introduces an illuminance loss that increases with power absolute value and we have e % ¼ À19.7% for À6 dioptres whereas a converging lens of power larger than 2 dioptres introduces a gain that increases with power and e % ¼ 20.4% for 6 dioptres.…”

“…In certain circumstances of everyday life [1][2][3][4][5] a foveally fixated subject is exposed to the effects of a glare source lying in the periphery of his field of view (for example headlights of oncoming vehicles when driving in routes at night or brief light exposures in some psycho-physical tests). The peripheral glare source causes a decrease in the perceived brightness of the foveal object, which can be accounted for in terms of a veiling luminance produced by stray light falling on the fovea [6].…”

Development of a low cost pupillometer-eyetracker and applications

“…In the latter, a device measuring ocular pupil diameter is termed pupillometer and that determining gaze direction is termed eyetracker. In tests determining visual performance it is usually of greater interest to know pupil diameter than gaze direction 27 whereas human-computer interfaces only require the determination of gaze direction 23 . Nowadays, commercial pupillometers-eyetrackers are usually integrated in one device often termed "eyetracker" (Tobii, Neuroptics, Arrington, etc.)…”

Diseño y puesta a punto de una técnica de medida de sensibilidad retiniana: Aplicación al estudio del comportamiento de la adaptación de retina periférica frente a campos luminosos estacionarios y transitorios

“…En el dispositivo experimental también se instaló una cámara CCD Retiga Exi modelo Fast 1394 para el control de la posición del observador y del tamaño pupilar (Figura 2.11). El desarrollo de técnicas para la medida de la pupila humana con luz infrarroja ha sido realmente útil para poder realizar estudios de la respuesta pupilar a diferentes niveles de iluminación (Colombo et al, 2007;Spadea et al, 2005;Bootsma, et al 2007). Siguiendo la técnica de usar luz infrarroja para la medida de la pupila, esta es iluminada por 8 LEDs infrarrojos (longitud de onda central de 830 nm), de modo que la cámara, que incorpora un filtro que bloquea la luz visible, permite ver en todo momento, a través de la película BS3, la pupila del observador (E).…”