RT Journal Article SR Electronic T1 The comparative study of refractive errors between carpet weavers and blue collar workers JF Saudi Medical Journal JO Saudi Med J FD Prince Sultan Military Medical City SP 912 OP 914 VO 27 IS 6 A1 Siamak Akbarzadeh A1 Morteza Samavati YR 2006 UL http://smj.org.sa/content/27/6/912.abstract AB