Instruction: Given a question and its related document, determine if the question is answerable by analyzing the information in the document. Output yes if the document addresses the question, or no otherwise.

Input:
Question: I've got -2.75 & -1.75 eyes. Should I round up or down to the nearest diopter? For each eye.  2.5 or 3 for the 2.75 eye & 1.5 or 2 for the 1.75 eye?
Document: These goggles are remarkably inexpensive considering that they have corrective lenses. My prescription is -6.25 in the left eye and -6.75 in the right. It would have been nice if there were -6.5 lenses available so that I could split the difference between the two, but only single diopter increments are available at higher strength prescriptions.
That said, I got the -2's with my -2.25/-3.0 eyes and are significantly better than normal goggles. YMMV.
I picked up a 3.5 and a 5.0 smoke pair for $32.63 for the two pairs, forced the pieces apart (it was a bit tough - I thought I'd break them, but they didn't) and reattached them to make 2 complete pairs of custom prescription goggles for myself.
This is a well constructed pair of goggles. My prescription is about -2.75 so as per the suggestions of many I went with the lower strength lens which is -2.50 rather than -3.00. The level of correction is almost perfect underwater and almost as good out of the water allowing me to read a small clock on the wall to keep track of elapsed time. For around $16 these googles greatly exceeded my expectations.
My 9 year old needs a -3.75. Without these he's swimming blind and playing blind when in the pool. We bought these in the spring before swim team season hoping they would not leak and would work well for him. The first day he was in the pool with them he was so excited and went around telling everyone "I can see!" We're 2/3rds of the way through the swim team season and they haven't let us down at all.
I'm so excited to have found these goggles. I love swimming, but couldn't see the clock or who was talking to me. I have 2 different prescriptions (one is -3.25 and the other is -3.5), and I just ordered the weaker one. The lenses are slightly gray-tinted, which is kind of nice in the brightly lit pool.
I have terrible vision, so swimming at the gym without vision correction wasn't so pleasant. My prescription is different (-4.75 in one eye, -4.25 in the other eye), so I was worried about using goggles that weren't the right prescription. I went with the -4.5 clear goggles, and I haven't had any trouble. I can see all the way across the pool above and below water.
Yes, these are essentially reading glasses. Preset +1, +2 type corrections. This is great if your eyes require exactly +1 or +2 correction. I have astigmatism so just getting the +/- correction only gets my part of the way to seeing clearly.Functionally as swim goggles these are comfortable and seal well once adjusted to my face. Can I see better than when using my normal goggles? Yes. Can I see as well as with my real prescription contacts or glasses?
My prescription varies in both eyes, -4.75 and -4.25, so I got the -4.50. They are not perfect, but at the price, they are very, very good, and the water drops and streaks that inevitably arise on the inside of the lenses (you are not going to keep the goggles perfectly dry on the inside) and interfere a bit with focus make it doubtful that I'd get the kind of improvement that would make expensive custom jobs worthwhile.
I ordered both a -3.00 and a -4.00 pair (as mentioned in another review) and then combined them into two pairs each with -4.00 right eye and -3.00 left eye. This worked perfectly. This is the first time in years that I've had such great vision when swimming. My prescription calls for -3.25 and -4.25 and, as advised by other reviewer, I ordered the slightly lower power.
Answer: no