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Based on limited metadata, this warning letter was issued to Hoya Corporation's Pentax Life Division on March 9, 2018, regarding products classified outside the traditional medical device categories. Without access to the full letter text or specific subject line details, the precise nature of the violations cannot be determined from the available information. The issuing FDA office is not specified in the metadata provided. To understand the specific regulatory concerns and required corrective actions, the complete warning letter would need to be reviewed.