(Kelly of the Clue Crew shows an anatomical diagram on the monitor.)  This irregularity in the eye's surface bends the ray of light so that it can't be brought to a single focus, resulting in blurring
... that which permits no inquiry will result in no 
enlightenment so ... so let us frolick in the fens, i'll watch the sparkling of your 
gems and you shall follow through the .... it's when you bend down and tie your 
shoes [DOC] [TLE] Inside Health - BBC [PAR] So the race is on to identify and diagnose the thousands who don't know that they
're ... also have iron deficiency so might iron be a clue to a new type of treatment?