(maybe a pretty sensitive topic below, but i tried to tone it down so it could be more appropriate) One of my side character would be a woman who was sold by her own father to pay his debts to a mafia boss. Then, the boss kept her as a captive in his basement for 13 years and made her his 'personal slave'. One day, this woman saw the mafia boss fell from the stair that connects the basement to the upper level, full of bloods and wounds. Then MC come and slaughtered the mafia boss, but before he died, he begged for mercy by offering the woman as the price for his freedom. MC then broke the chains that restrained her and gave her the option to start a new life by leaving the place, but the woman decided to join MC's cult as a payback instead. In the story, she would be a sniper or the team because how she spent 13 years without sunlight (she was 22 when she met MC for the first time, so her father sold her when she was 9. Also there's a 5 year time gap between their first meeting and the main event of the story). The question is, is it possible that spending 13 years in a basement without a slightest sight of sunlight would enchance her eyesight, and thus making her a better sniper? Or instead, will it make her eyesight worse because her eyes don't adapt to sunlight like how others should?