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Medical Forum / General / Vision / February 2008Accommodative response Define Please
I want a simple definition of the term accommodative response sometimes spelled accommo-dative response. Is it as simple as how much the lens adjusts trying to focus? Thanks, Mike The term is used in the lighting article at, http://www.lightenergysource.com/ScotopicTechnical.htm Accommodative stimulus is the optical distance to an object, and yes, "response" can be measured as contraction of the ciliary muscle. The word is never hyphenated. That was a word-wrapping artifact. As far as the article, I was a little puzzled by how significant rods can be in normal room light. The physiologists told us that rods were pretty well oversaturated at normal room illumination. It's why you have to wait 30-60 minutes in the dark for rods to "dark-adapt". -MT > I want a simple definition of the term > accommodative response sometimes spelled [quoted text clipped - 4 lines] > The term is used in the lighting article at, > http://www.lightenergysource.com/ScotopicTechnical.htm >Accommodative stimulus is the optical distance to an object, and yes, >"response" can be measured as contraction of the ciliary muscle. [quoted text clipped - 5 lines] >oversaturated at normal room illumination. It's why you have to wait 30-60 >minutes in the dark for rods to "dark-adapt". Well, they don't need a build-up of rhodopsin to see in bright light. Though it's always been my understanding that in normal illumination, rods are primarily responsible for motion detection.  Signature- Mike Ignore the Python in me to send e-mail. On Feb 1, 9:59 pm, Mike Ruskai <BUTthann...@DONTearthlinkLIKE.netSPAM> wrote: > Well, they don't need a build-up of rhodopsin to see in bright light. > Though it's always been my understanding that in normal illumination, > rods are primarily responsible for motion detection. rods are only partially functionally under normal daylight conditions. the majority of vision in humans under those lighting conditions is considered to be contributed by cones which operate under much higher light levels. adaptation has much much more to do with other mechanisms than opsin content. there are neural pathways within the inner and outer plexiform layers of the retina, and within the CNS, that tune vision to the ambient lighting conditions |
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