A method for adjusting a light adjustable lens in an optical system (140) includes providing a light adjustable lens (130) in an optical system； providing an ultraviolet light source (110) to generate an ultraviolet light； and irradiating the generated ultraviolet light with a light delivery system (120) onto the light adjustable lens with a center wavelength and with a spatial irradiance profile to change a dioptric power of the light adjustable lens by changing a refraction of the light adjustable lens in a refraction-change zone, thereby causing a wavefront sag, defined as half of a product of the change of the dioptric power and the square of a radius of the refraction-change zone, to be within 28% of its maximum over an ultraviolet spectrum.
