亚洲中文无码日韩A∨精品亚洲免费观看网_久久不卡人妻无码_色综合久久综合香蕉色老大_亚洲色大成网\站久久久_国产一区免费Av_国产精品好好热AV在线_中文字幕第一頁亞洲_熟女老女人的网站_色猫咪av男人的天堂_亚洲国产天堂久久精品网

Standard logarithmic VA chart

It is applicable to the vision examination in the ophthalmology department of each hospital, as well as the vision examination in glasses and general occasions. It has the characteristics of soft light, no stroboscopic, uniform brightness, and beautiful appearance.