Korean J Ophthalmol Vol.20, No.4, 2006 Fig. 3-1. The OCT shows the normal finding of the cross- sectional retinal image (right eye). Fig. 3-2. The OCT shows the normal finding of the cross- sectional retinal image (left eye). Fig. 4. Ring-shaped paracentral hyperfluorescence appears simulta- neously with a central halo in the early phase (white arrow, right eye). 252 Fig. 5. The dark center of the lesion is surrounded by progres- sively increasing hyperfluorescence in the late phase (white arrow, right eye). Fig. 6. Ring-shaped paracentral hyperfluorescence appears simulta- neously with a central halo in the early phase (white arrow, left eye). in their body temperature due to the environment in which they work. Furthermore, since wearing protective masks reduces their field of vision, many welders frequently prefer not to use them for simple welding. The most frequent ocular damage from welding is photo- keratitis. It takes about 6 to 12 hours for the symptoms to occur after the exposure to light radiation during welding.