PORTLAND — A federal judge has fined an eyeglass lens manufacturer $750,000 for repeatedly discharging hazardous waste into Clackamas County’s sewer system in violation of the federal Clean Water Act. U.S. District Judge Michael H. Simon fined Carl Zeiss Vision on Monday. Prosecutors say the company operated for three years without a required industrial wastewater discharge permit and allowed untreated corrosive liquid waste that included cadmium and lead to seep into a public sanitary sewer connection that fed into the county’s water service sewer system. Carl Zeiss Vision pleaded guilty in January to misdemeanor violating federal regulations requiring treatment of pollutants.