Quote:
Originally Posted by ngcles
Of course the only way to know for certain is to measure it -- and I believe based on what I've read elsewhere it is possible to do this. The procedure of course will re-enforce in your respective families a belief that you are completely nuts.
Start with a rainy or cloudy evening and get a camera (digital is best for instant results) with a flash, tripod and a suitable rule/measure and a mirror. Set the camera/mirror/rule set up so you can take a close-up photo of your face in good focus in the mirror with the rule/scale close to your eye and in focus -- in complete darkness. Make sure the red-eye reduction (pre-flash flash) is off. Get it all set up exactly right and then shut and the door and any blinds to the room turn the lights off and ... dilate.
After 10 mins your iris will be fully open. You won't be fully (chemically) dark adapted but it won't matter. Take the photo in complete darkness and compare the iris diameter to the rule/scale.
Simple.
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That doesn't sound simple.
Some years ago S&T magazine sold a pupil gauge where you could measure your dark adapted dilation using a simple template. This was based on a make your own pupil gauge article publised in TM magazine even more years ago.
According to this template, my fully dilated pupil extends to 6mm, sometimes less. If anyone is interested you may PM me and I will see if I can locate the article.
As to the accuracy of the respective measures, I have no data.