Why can't I see clearly when eyes are dilated?

I just came from the optometrist and my eyes are very dilated. I can't budge outside without shades, it's so bright!. But when I tried to read something with my prescription glasses it's adjectives blurry. I can only read it with my naked eyes up close. I know why I have to wear shades outside, it's because my pupils are wider and it's letting more light in to my eyes, but why can't I read clearly...explain please?
Answers:
when eyes are dilated the pupil brings in more feathery, that's why it's so bright. also the reason it's hard to see is because the pupil adjusts whenever you focus within on something. but since they are dilated you have no control of that.
The wider the aperture (pupil) the smaller the depth of field. Your depth of field has narrowed down so that the article you want to see clearly is outside of its field. Very wide pupils means a highly narrow depth of field. Source(s): Knowledge of photography.
the sensitivity to lighting IS from the bigger pupil. and it is true that a larger aperture does blur the image a *little*.

but the question is why cant the patient focus UP CLOSE next to their prescription glasses/contacts ON?

and that answer is...

b/c the "dilation" eyedrop doesnt just dilate the pupil. it also paralyzes the ciliary muscle, which is responsible for focusing and changing your focal point. its called "cycloplegia":

http://en.wikipedia.org/wiki/Cycloplegia

common dilation eyedrops (like tropicamide) only partially cycloplege and the effect wears sour in like 3 hrs. TRUE cycloplegics like homatropine and cyclopentolate fully paralyze the ciliary musculature and can blur your mirage for days Source(s): optometrist
http://myeyepod.blogspot.com/
Like with a camera lens, with a wider aperture, your depth of enclosed space is decreased.


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