Talk:Adaptation (eye)

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Contrast ratio[edit]

"However, in any given moment of time, the eye can only sense a contrast ratio of one thousand". I remember reading somewhere, don't remember where, that the human eye could only sense a contrast ratio of 1:100 at a given moment. Whichever is correct, we need to find a reference for it. Kaldari (talk) 18:13, 24 September 2009 (UTC)

Very Poor[edit]

Some work needs to occur. In between this and the Night Vision article, you learn nothing. To add:

Comprehensive information on, for instance, ability percentages of different animals.84.92.169.252 (talk) 15:21, 3 June 2010 (UTC)

Rephrasing and elaboration required[edit]

I presume the following would be crucial to a basic understanding of adaptation to dark.

"Inhibition by one neuron on another is just as important as activation in synapses. Together with the bleaching of a rod or cone pigment, merging of signals on ganglion cells are inhibited, reducing convergence. Alpha adaptation, i.e. rapid sensitivity fluctuations, is powered by nerve control."

Instead of actually increasing the reader's wisdom, this only servers to bewilder them. What is alpha adaptation, is the control voluntary, what is convergence, why are signals merged, is bleaching done in the dark, why is inhibition important?88.112.37.71 (talk) 13:09, 25 October 2011 (UTC)

Not good[edit]

What about animal eye adaptation? — Preceding unsigned comment added by 74.131.171.6 (talk) 18:28, 30 January 2013 (UTC)

I noticed all the tests on adaption is getting fairly old some 1980~ 30+ years ago.[edit]

(Sorry for my english, im norwegian)

However i wasnt able to see how many people were actualy in these tests... how realistic are these tests? have there been controll tests to verify.. i mean the grey area in the test showing 80% of the people% had a pretty large radius difference, up to 3-4 minute faster, not counting those 20% whit faster or slower where the range is increased even more, and it does look like most of the reseptors for dark vision sets inn in about 10 minutes, then the other 20 minutes its slowly adapting more... and even if i count those 10 minutes, it still looks to be lots of people getting most of their dark vision in 5...

However i still find the problem of how many was in the test... i mean... i know people who claim their eyes addapt in about 2 minutes to very low light levels, from a bright room.. and i can say myself i also feel like i have realy fast dark vision.

And then again i suspect this test has less than 4000 people or and most of them must be originating from same contry as the test came from, wich means their eyes are probebly more addapted to how many months of the year theyr exposed to darkness.

Like for example me, im from norway, and here it feels like its dark some 5-6 months of a year and cant say its much light troughout the summer.

Now take sombody for example from Egypt, daylight probebly every day.... and this might have a major impact...

This is why i suspect the test has less than 4000 people.. does anyone have any actual numbers, or and why isnt this on the wiki page as this would be important for accurasy of the topic of how long it takes to addapt.

Seeing the links below where i followed them, i couldnt seem to find any number of people involved..

again, terrible sorry for my english, and i hope that doesnt impact the very important question.