A vehicle mounted engine control apparatus serves to prevent air fuel ratio control from becoming an excessively fuel rich state by sequentially actuating heaters for early activation of a pair of exhaust gas sensors arranged in an upstream and a downstream position of a catalyzer. A reflecting surface of a light-transmitting member formed of an optically transparent material, for example, a glass plate, has minute hubbly surface profile formed therein by blasting the reflecting surface with an abrasive or the like to mill the surface. The present invention further relates to methods for measuring the inhibitory activity of a test compound on uridine-diphosphate-N-acetylglucosamine formation in a human or an animal. The front part is movable forwardly relatively freely once the catch is released. The control unit calculates the absorbance of light received by the light-receiving section, and calculates the calories of the analysis target on the basis of the calculated absorbance and on the basis of the correlation between absorbance and calories. The extract was used to prepare drugs or food for protecting eye cells.