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4 Responses to “What are the rods and cones of eyes in terms of night vision?”

1. Dave T Says:
   February 9th, 2011 at 12:49 am

   In the human eye, the cones are for color reception and the rods are for light reception. As light intensity lowers, the cones no longer operate and only the rods are able to detect.

   So your night-vision is basically just the rods in your eyes detecting light.

2. jennie b Says:
   February 9th, 2011 at 12:49 am

   This website will help explain the rods and cones to you and how they relate to night vision and color perception.

   http://hyperphysics.phy-astr.gsu.edu/hbase/vision/rodcone.html

3. paulzy_jlp Says:
   February 9th, 2011 at 12:49 am

   learned this a while back, almost completely sure though that the cones are what allow us to see color. The rods are what allow us to see black and white. Thats why at night, there is less light hitting our eyes and the cones cant focus on the object right.

4. Nita and Michael Says:
   February 9th, 2011 at 12:49 am

   Rods and Cones
   The retina contains two types of photoreceptors, rods and cones. The rods are more numerous, some 120 million, and are more sensitive than the cones. However, they are not sensitive to color. The 6 to 7 million cones provide the eye’s color sensitivity and they are much more concentrated in the central yellow spot known as the macula. In the center of that region is the " fovea centralis ", a 0.3 mm diameter rod-free area with very thin, densely packed cones.

   The experimental evidence suggests that among the cones there are three different types of color reception. Response curves for the three types of cones have been determined. Since the perception of color depends on the firing of these three types of nerve cells, it follows that visible color can be mapped in terms of three numbers called tristimulus values. Color perception has been successfully modeled in terms of tristimulus values and mapped on the CIE chromaticity diagram