- The size of minus eyes have many (more than minus 4), so if the glasses will look thick and very heavy.
- The size of minus right-left eye is so much difference if the glasses do not always comfortable.
- Many operate outside the room who feel disturbed if the glasses, including those who do a lot of sports activities.
- Health eyes expressed both by doctors, for example, the condition of the eye ball is not easy iritations production and enough water eyes.
- Need aesthetic appearance. When someone will attend the party, that appearance is not "disturbed" by the glasses, he can temporarily switch to softlens. Likewise, they need a variation appearance because softlens now colorful.
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