The most common and most likely answer to this crossword clue is the 8 letter word MONOCLES
M
O
N
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C
L
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S
More clues leading to the result MONOCLES
Buddy explains!

The straight part
We know that "lenses" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case lenses = monocles.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does MONOCLES mean?
MONOCLES noun- A single lens, usually in a wire frame, and used to correct vision for only one eye.
- A one-eyed animal.