Fig. (1) Increased reactive oxygen species after ultraviolet irradiation over lens epithelial cells. Before UBV irradiation, fluorescent level was quite low (upper left). After UVB irradiation, intracellular reactive oxygen species reacted with no fluorescent 2′,7′-dichlorodihydrofluorescein to form fluorescent 2′,7′-dichlorofluorescein (upper right). The intensity of fluorescence decreased with pre-treatment of carteolol hydrochloride before UVB exposure (lower left).