英文關鍵字
adult
age
asian
astigmatism
chinese
concept
copy
eye
eyeglasses
eyesight
face
fatigued
focusing
frustrated
glasses
health
holding
human
hyperopia
japanese
korean
looking
man
middle
mobile
myopia
old
people
person
phone
presbyope
presbyopia
problem
risk
seeing
senior
sight
smart
space
stress
telephone
tired
trouble
troubles
trying
use
vision