TY - GEN AU - Pearl,S S TI - Red color blindness SN - 0007-9235 PY - 1978///1229 KW - Color Vision Defects KW - complications KW - Humans KW - Male KW - Rectal Neoplasms N1 - Publication Type: Case Reports; Letter UR - https://doi.org/10.3322/canjclin.28.4.238 ER -