I recommend Jamsil Snowman Eye Clinic.

If you need eye care, vision tests, or anything else, check out Jamsil Snowman Eye Clinic. I went there on a friend's recommendation, and it was fantastic. The facilities are nice and clean. The doctors are friendly and attentive to patients, and they provide thorough explanations. However, because it's so popular, even with a reservation, there may be a slight wait.