Eye pain has greatly diminished too. eye strain (so very common, esp if you work on a computer for many hours at a time). Eye pain could also be a sign of arthritis (esp rheumatoid arthritis) - do you have any other aches and pains. Have a full blood count, and ask to check your antibodies to rhuematoid arthritis and lupus.
SSI: Social Security Income: SSI: Strategic Studies Institute (US Army War College) SSI: Sensitive Security Information (US DoT)
Serial Peripheral Interface (SPI) Introduction. Serial Peripheral Interface (SPI) is an interface bus commonly used to send data between microcontrollers and small peripherals such as shift registers, sensors, and SD cards. It uses separate clock and data lines, along with a select line to choose the device you wish to talk to.