The invention provides lenses and sunglasses, and relates to the technical field of photoelectric equipment. The lenses comprise a power supply device for supplying electric energy, a signal acquisition module for acquisition of an electroencephalogram signal, a signal processing module for processing the electroencephalogram signal, a control output module for converting the signal into a voltage signal, and lens bodies which can have a color changed along the voltage signal. The sunglasses comprise a glasses frame, a glasses bracket and the lenses. The various modules are in interaction, the sunglasses color is adjusted in real time according to the subjective intention of a user, and the technical problems in the prior art that conventional sunglasses have long sunglasses color adjustment consuming time, the color is adjusted only according to the sunlight intensity, the response difference of different individuals on sunlight is ignored and accurate color adjustment on people subjective intention cannot be performed are solved.