In addition to all everyone has said, you also need to take in the idea that no matter how good, bad or sensitive your eyes are, when given long term protection (prescription glasses, prescription contacts, or just wearing sunglasses for a long periods of time), the eyes still belong to a human being.
Humans tend to do the rather nifty (or annoying, depending on your point of view) thing of adapting. What may have started off as a fashion thing or just simply a protection from the summer sun, can turn into a necessity as the eyes become more used to a shaded view of the world and have difficulty adjusting back to harsher or brighter lights in a shorter time frame. The user will therefore feel pain or discomfort and will possibly believe they simply cannot do without the protection. Put into a longer time frame, their eyes will become more dependent on a dimmer shade.
Over time, an original medical condition could also develop (deteriorate) and the sufferer could indeed become more dependent on protection/prescription lenses etc.
Becoming depending from overuse could be one reason, medical condition could be another, becoming even more dependent on top of a medical condition could also be another reason.
Yoshiki is also often seen with sunglasses. Occupation could also be an underlying reason - they are celebraties who rarely get plenty of sleep and good long rest. Relieving strain by using sunglasses (from direct or indirect sunlight, camera flashes, normal lightings) would be a smart thing to do regardless of known previous medical conditions or dependency.
Or you know, he might wear them just for shits and giggles. (Maybe he's in cahoots with Yoshiki, 'hey man, if we both wear sunglasses all the time, maybe our fans will be all omfg Gackt and Yoshiki are so totally doing each other, imagine our scandalous gossip! It'll be like free media attention!')
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Humans tend to do the rather nifty (or annoying, depending on your point of view) thing of adapting. What may have started off as a fashion thing or just simply a protection from the summer sun, can turn into a necessity as the eyes become more used to a shaded view of the world and have difficulty adjusting back to harsher or brighter lights in a shorter time frame. The user will therefore feel pain or discomfort and will possibly believe they simply cannot do without the protection. Put into a longer time frame, their eyes will become more dependent on a dimmer shade.
Over time, an original medical condition could also develop (deteriorate) and the sufferer could indeed become more dependent on protection/prescription lenses etc.
Becoming depending from overuse could be one reason, medical condition could be another, becoming even more dependent on top of a medical condition could also be another reason.
Yoshiki is also often seen with sunglasses. Occupation could also be an underlying reason - they are celebraties who rarely get plenty of sleep and good long rest. Relieving strain by using sunglasses (from direct or indirect sunlight, camera flashes, normal lightings) would be a smart thing to do regardless of known previous medical conditions or dependency.
Or you know, he might wear them just for shits and giggles. (Maybe he's in cahoots with Yoshiki, 'hey man, if we both wear sunglasses all the time, maybe our fans will be all omfg Gackt and Yoshiki are so totally doing each other, imagine our scandalous gossip! It'll be like free media attention!')