• rods
  • Dark-adapted vision in humans is basically devoid of colour because it depends almost entirely on the functioning of rods. (britannica.com)
  • When a larger test spot is used during dark adaptation, a rod-cone break would be present since the test spot stimulates both cones and rods. (org.es)
  • As the test spot becomes even larger, incorporating more rods, the sensitivity of the eye in the dark is even greater (figure 6), reflecting the larger spatial summation characteristics of the rod pathway. (org.es)
  • Rod sensitivity improves considerably after 5-10 minutes in the dark, but rods take about 30 minutes of darkness to regenerate photoreceptors and reach full sensitivity. (wikipedia.org)
  • The rods are not saturated by the bright red light because they are not sensitive to long-wavelength light, so the crew members remain dark adapted. (wikipedia.org)
  • This is due to cones obtaining more sensitivity when first entering the dark for the first five minutes but the rods taking over after five or more minutes. (wikipedia.org)
  • Changes in the sensitivity of rods and cones in the eye are the major contributors to dark adaptation. (wikipedia.org)
  • A year later, researchers found that mice without any rods or cones, the cells involved in image-forming vision, still entrained to a light-dark cycle. (wikipedia.org)
  • Varying
  • Varying rates or speed of adaptation is an important indicator for tracking different rates of change in the environment or the organism itself. (wikipedia.org)
  • luminance
  • This can be measured by placing a subject in a dark room, and increasing the luminance of the test spot until the subject reports its presence. (org.es)
  • The Purkinje effect (sometimes called the Purkinje shift or dark adaptation) is the tendency for the peak luminance sensitivity of the human eye to shift toward the blue end of the color spectrum at low illumination levels. (wikipedia.org)
  • experiments
  • In pilot experiments with two early and two intermediate AMD patients, dark adaptation was measured at 5° (adjacent to the fovea) and 12° (just outside the macula). (arvojournals.org)
  • In pilot experiments, intermediate AMD patients who exhibited essentially no dark adaptation in 20 minutes when bleached with a relatively strong flash (≥ 82% effective bleach) had a rod intercept ≤ 20 minutes when bleached with a weaker flash (≤ 56% equivalent bleach). (arvojournals.org)
  • In the 1890s, psychologist George M. Stratton conducted experiments in which he tested the theory of perceptual adaptation. (wikipedia.org)
  • WIRE
  • In recent years we've seen how long stories on television, whether adaptations ( Game of Thrones ) or original ( The Sopranos , The Wire ), can reach depths of characterization and heights of suspense by taking the time for events to make their proper impact and for consequences to unravel. (deadline.com)
  • mechanism
  • Four factors affect dark adaptation: Intensity and duration of the pre-adapting light By increasing the levels of pre-adapting luminances, the duration of cone mechanism dominance extends, while the rod mechanism switch over is more delayed. (wikipedia.org)
  • cones
  • When a small test spot is used during dark adaptation, a single branch is found as only cones are present at the fovea. (org.es)
  • humans
  • In order for humans to transition from day to night vision they must undergo a dark adaptation period in which each eye adjusts from a high luminescence setting to a low luminescence setting. (wikipedia.org)
  • There exist many ways in which humans can accelerate the dark adaptation period and therefore gain full vision in low luminescence settings in a shorter period of time. (wikipedia.org)
  • vision
  • visual purple) are involved in dark vision. (britannica.com)
  • for better vision in a dark environment. (britannica.com)
  • The ultimate goal is to facilitate clinical trials for development of early-stage interventions by validating dark adaptation as a surrogate marker for future vision loss in AMD. (arvojournals.org)
  • Submarines are well lit to facilitate the vision of the crew members working there, but the control room must be lit differently to allow crew members to read instrument panels yet remain dark adjusted. (wikipedia.org)
  • Tower
  • Variety stressed that as of last night, The Dark Tower was still in development at Universal, Javier Bardem was inches away from being signed, sealed and delivered to play Roland, and scripting was still underway. (syfy.com)
  • Will The Dark Tower still go forward, and can the first movie still meet its May 17, 2013, release date? (syfy.com)
  • colour
  • Fruits and vegetables containing high amounts of carotenoids are dark green, yellow, orange, and red in colour. (wikipedia.org)
  • full-field
  • Light- and dark-adapted full-field ERG recordings were obtained over a 5-log-unit intensity range from both eyes of 25 patients with unilateral wet AMD. (arvojournals.org)
  • test
  • In order to perform this test, the child is asked to sit in the dark for a half-hour. (wikipedia.org)
  • night
  • A nightlight is a small light fixture, usually electrical, placed for comfort or convenience in dark areas or areas that may become dark at certain times, such as at night or in an emergency. (wikipedia.org)
  • In addition, nightlights may be useful in locations other than sleeping areas, such as hallways, bathrooms, or kitchens, to allow late night trips to be made without turning on the full light, while preserving a dark sleeping environment. (wikipedia.org)