. >> brangham: amber singleton is an optician with vision to learn.she travels from school to school helping kids get the right prescription. >> we pretty much a pretest, just kind of get a starting point for the prescription. then once i have that preliminary information, i send them back to the doctor. they'll do a full exam. >> brangham: after the exam, students get to pick fashionable frames in black, red, pink and blue. >> i picked pink because that's my favorite color. >> brangham: we returned a couple weeks later to matthew a. henson elementary school when students got their first pairs of free glasses >> well hello, how are you? what's your name? >> brangham: fifth grader markell gibson is getting her first pair ever. so how much of a difference do glasses really make? i asked markell to read a simple book with and without her new glasses. here's how she read without them: >> (reading slowly): but mother, said the little one, why do you love me when sometimes i am naughty and run away when you try to dress me. i never said i stopped loving you