there isn't that much difference between the two, but if you look over an extended period of time, you'll get less eyestrain with the 8x- most binocs have compensating ocular lenses so near/farsightedness isn't really much of a problem- typically , you have enough compensation on the right diopter( that's the plus and -signs on the lens) to compensate - i use mine with my glasses, but others take their glasses off- so unless you NEED to see detail, go with the 8s- you'll feel the 10x "pulling" a bit over the extended period