Whit and I like the second one. #3 has too much red. Red and eyes don't go well. I like the "Eye Center" on #2. It's sharp and clear. #1 is a little too soft. Good luck.
I agree with the TN McAdamses. The first one looks like an angry eye and is not very inviting. I like the second one because green is a cooler tone color that relaxes people (it is the reason B-ville's new high school had a green interior despite are school colors being red) and the eye is not scary, the third one is red and is not appealing, but to aggressive, and the last one doesn't look like an eye. Good luck with the business
the second one is creepy. I like the 3rd and 4th one. I like the blue and grey colors on the 4th one. For a slogan, how about, "YOu'll see Miles with Miles eye center." Or how about, "Miles Eye Center, where seeing matters..." "WHere the three blind mice came to get their sight." Clint