1. Presbyopia
Presbyopia, also known as presbyopia, is a class of optical products for people with presbyopia glasses, belonging to a convex lens. Presbyopia is mainly to meet the needs of people with presbyopia.
Presbyopic lenses are used for middle-aged and elderly people to supplement their eyesight, and it has many national standards of optical indicators as myopic lenses do, and also has some special rules of use. It is the same as the general sunglasses, only based on the style and color customers can judge the suitability of the purchase.
2. Magnifying Lens
Magnifying Lens Definition: Magnifying Lens (English name: magnifier): a simple visual optical device for observing minute details of an object, is a converging lens with a focal length much smaller than the visual distance of the eye. Objects in the retina of the human eye on the size of the image is proportional to the object to the eye opened angle (angle of view).
3. Crutch
A simple device, usually a wooden or metal stick, that aids in walking. Crutches are an important medical rehabilitation aids, divided into cane \ elbow cane \ axillary cane, of which the cane is mainly used for light needs, such as the elderly or hikers, the cane is not a disabled person's supplies, the elbow cane belongs to the moderately lower limb disabled person's supplies.
4. Electronic sphygmomanometer
Electronic sphygmomanometer is the use of modern electronic technology and the principle of indirect measurement of blood pressure for blood pressure measurement of medical equipment.
Electronic sphygmomanometer has arm, wrist, watch type; its technology has experienced the most primitive first generation (mechanical fixed speed exhaust valve), the second generation (electronic servo valve), the third generation (pressurized synchronous measurement) and the fourth generation (integrated airway) development.