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Just how awful *is* Harry Potter's eyesight



“Harry, your eyesight really is awful,” said Hermione, as she put on glasses (Deathly Hallows, Chapter Four - "The Seven Potters")



In-universe, do we know to what extent Harry Potter's eyesight was bad?



Obviously, we wouldn't have exact prescription dioptre numbers, but what I'm hoping for is some canon or WoG example of Harry not able (vs able) to see something specific when not wearing glasses.



Answer



After taking polyjuice potion, he sees with Goyle's (unaided) vision. His glasses "cloud" his eyes, suggesting that his vision (with glasses) must be at least 4-5 points off 20:20. Anything less and his vision would simply be distorted rather than actually blurry:



Then he realised that his glasses were clouding his eyes, because Goyle obviously didn’t need them - HP: CoS



He can't see well enough to distinguish that what he's looking at is a large dog, but he can see well enough to tell that it's an animal of some kind:



Harry set down his goblet and was about to turn back to his bed when something caught his eye. An animal of some kind was prowling across the silvery lawn. - HP: POA




He can distinguish his location and make out his friends easily from across the room. If he squints, he can bring his vision to something approaching normality:



Everything was slightly blurred. Somebody had removed his glasses. He was lying in the dark hospital wing. At the very end of the ward, he could make out Madam Pomfrey with her back to him, bending over a bed. Harry squinted. Ron’s red hair was visible beneath Madam Pomfrey’s arm - HP: PoA



Familiar people have "fuzzy outlines", again, suggestive of moderate myopia



He could see the fuzzy outlines of Mrs Weasley and Bill close by. Mrs Weasley was on her feet. ‘That’s Fudge’s voice,’ she whispered. ‘And that’s Minerva McGonagall’s, isn’t it? But what are they arguing about?’ - HP: GoF



Room is blurry




Harry emerged from behind his towel; the changing room was blurred because he was not wearing his glasses, but he could still tell that everyone’s face was turned towards him. - HP:OotP



He can't distinguish individual firework sparks



He got into bed, yawning. With his glasses off, the occasional firework passing the window had become blurred, looking like sparkling clouds, beautiful and mysterious against the black sky. - HP: OotP



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