Kev ntsuam xyuas pom kev tshuaj xyuas ntau lub luag haujlwm ntawm lub qhov muag. Others may check how sensitive you are to glare (brightness acuity), how well your eyes work together to provide depth perception, etc. Qhov kev ntsuam xyuas pom kev feem ntau ua nrog kev kuaj xyuas thiab Kev ntsuam xyuas uas kuaj xyuas kev noj qab haus huv ntawm lub qhov muag.