We should be unambiguous with our terms. Gravitational lensing and refraction of light are not the same thing. (I wasn't positive myself, but I had enough suspicion to make me check.) In case there's any doubt: Refraction of light through an optical medium is chromatic - different wavelengths refract at different angles. Gravitational lensing of light is achromatic - all wavelengths are bent to the same degree. So, we should stop using the term refraction.