This is a magnifying aid for people who have eye problems but still have some sight. Printed material and objects can be placed under a camera and the magnified image is displayed on a television screen or computer monitor. They are mostly used for reading, but can also be used for writing and other activities such as sewing.  There are both
desktop systems and portable systems available, many systems now also come with the option to use the camera to take pictures of your documents and have them read back to you (OCR), this is especially useful if you tire easily from using magnification. Examples include:
Humanware Reveal 16 CCTV
Explore 5 Portable CCTV
LVI MagniLink CCTV
Zoomax Snow 12 Portable CCTV