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Old books and eye glasses with sharp vision through them on the books against the indistinct (unsharp, not in focus) background - Concept of visual acuity return
Keywords:
collection
education
stack
page
book
antique
library
wisdom
literature
science
old
paper
research
reading
shelf
bookshelf
learning
eyes and glasses
glasses and eyes
bookshelf background
eye glasses
glass shelf
book return
book returns
books return
old eyes
shelf with books
return goods
through the looking glass
through the looking-glass
clear vision
eye glass
glasses and book
not background
reading glass
resource library
resource center
book on the shelf
visual acuity
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