Cryptic crossword clue
Jerk splits stone, affecting his eyesight 7

The most common and most likely answer to this crossword clue is the 7 letter word OPTICAL

I've seen this crossword clue in The Times
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The straight part
We know that "affecting his eyesight" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case affecting his eyesight = optical.
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 OPTICAL mean?

OPTICAL adjective
  1. Of, or relating to sight; visual.
  2. Designed to assist or enhance sight
  3. Of, or relating to optics.
  4. Of, or relating to visible light.
  5. Incorporating light-sensitive devices.

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