The Nikon 310 has a CCD sensor type which is better than most bridge cameras that came out around the same time as it. Most digital cameras of a comparable type and age to it have a MOS sensor type. CCD sensors produce high quality, low-noise images but consume a lot more power than CMOS sensors. CCD is the most common image sensor type used in digital cameras.
This camera's sensor type (CCD) is in fact the best sensor type amongst all bridge cameras that have been around for around the same time as the 310.
Amongst comparable types of camera the worst sensor type is MOS.
Other digital cameras that have a CCD sensor currently available which you might want to consider include the Canon SX50 HS[plb_1410250_price] which has better reviews.