By adding words relating to sight, like "see", "view" and "gaze", the author can create a more vivid symbolism of what the sense of sight means in this passage.
When it talks about putting out both of the listener's eyes, Jonathan Swift could add details including this type of words to add to the imagery of sight.
Hi Mrs/Mr. <blank>, I should type my essay because it's more efficient, you can finish grading everyone's essay quicker, and turning it in online ensures that plagiarism will be caught if I happen to use any; this benefits us both.