{"data":{"id":"us/21-cfr-886.1090","jurisdiction":"us","citation":"21 CFR 886.1090","heading":"Haidinger brush.","body":"(a) Identification. A Haidinger brush is an AC-powered device that provides two conical brushlike images with apexes touching which are viewed by the patient through a Nicol prism and intended to evaluate visual function. It may include a component for measuring macular integrity.\n(b) Classification. Class I (general controls). The device is exempt from the premarket notification procedures in subpart E of part 807 of this chapter, subject to the limitations in § 886.9.","path":["Title 21—Food and Drugs","CHAPTER I—FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES","SUBCHAPTER H—MEDICAL DEVICES","PART 886—OPHTHALMIC DEVICES","Subpart B—Diagnostic Devices"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-21.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:24:47Z","sha256":"830bc2caf2665aa8ebd9a697a89ca915475ee50e2c7bab11abc45706f94d5bc0","source_id":"us-cfr","stale":true,"prev":"us/21-cfr-886.1070","next":"us/21-cfr-886.1100"},"notice":"GroundRules: Original legal text. Not legal advice."}