A kind of eyeshield range finder,It has one to incude ambient brightness luminous intensity sensing device,One can emit the infrared transmitting device of infrared ray and one induction infrared ray meet barrier Hou reflected and received with measure apart from infrared induction device,Above-mentioned each device is respectively transmitted a signal to a signal capturing interface,The document signals of brightness and distance values is represented by the transmission of signal capturing interface again to a central processing unit,And judgement Hou is carried out through the control formula in central processing unit,An order a to alarm device is sent out,Enabling it sound an alarm reminds user to pay attention to； And a control formula can determine whether that the standard of institute's Drawing upon is inputting by an operation interface to central processing unit,To be suitable for a variety of different use occasions.一種護眼測距器，其具有一用以感應環境亮度之光強度感應裝置、一可發射紅外線之紅外線發射裝置及一感應紅外線遇障礙物後經反射而進行接收以測定距離之紅外線感應裝置，上述各裝置分別傳送一訊號至一訊號擷取介面，再由訊號擷取介面傳送代表亮度及距離數值之資料訊號至一中央處理單元，且透過中央處理單元內之控制程式進行判斷後，送出一命令至一警報裝置，令其發出警報提醒使用者注意；而一控制程式可判斷所憑藉之標準乃藉由一操作介面對中央處理單元進行輸入，以適用於多種不同使用場合。
