The Optomap allows for a more comfortable retinal exam. Panoramic 200 Retinal Image - Click for hi resolution image. The top image to the right compares the doctor's view of your eye through an undilated pupil with an instrument called a direct ophthalmoscope (inner ring).
Medical devices are classified into Class I, II, and III. Regulatory control increases from Class I to Class III. The device classification regulation defines the regulatory requirements for a general device type. Most Class I devices are exempt from Premarket Notification 510(k); most Class II devices require Premarket Notification 510(k); and most Class III devices require Premarket Approval.
Ultrasonic pest repellers are electronic devices that emit high-frequency sounds designed to repel, injure or kill household pests, such as rodents and insects. Whether they're actually effective at doing so has been disputed by testing labs and the U.S. Federal Trade Commission (FTC).ltrasonic devices are popular and appealing to consumers because of their ease of use and the fact that they are silent to human ears and allegedly eliminate the need for traps and poison, which are thought by some to be inhumane forms of pest control.