I recommend the Dunsan-dong Eye Love Eye Clinic for vision testing.

My vision was blurry, out of focus, and strange, so I came to the Eye Love Eye Clinic in Dunsan-dong, Daejeon. The interior was clean and pleasant. The doctor told me to be careful, saying my vision had worsened significantly. I was prescribed eye drops and had an eye compress applied. I was also very pleased with the hospitality.