A lens adjustment system , comprising: an ultraviolet light source to generate an ultraviolet light; a light delivery system ; and a light adjustable lens , wherein the light adjustable lens is an intraocular lens which comprises photo-polymerizable macromers in a first polymer matrix, a photoinitiator, and a refraction-change zone having a radius; wherein the light delivery system is configured to irradiate the generated ultraviolet light onto the light adjustable lens when implanted in an optical system which is a human eye, with a center wavelength and with a spatial irradiance profile to photo-polymerize a portion of the photo-polymerizable macromers to change a dioptric power of the light adjustable lens by changing a refraction of the light adjustable lens in the refraction-change zone , and wherein the ultraviolet light source and the light delivery system are configured: for irradiating the light adjustable lens with the ultraviolet light having a center wavelength in a range of 370 nm to 390 nm, an average irradiance in a range of 1 mW/cm 2 to 50 mW/cm 2 and a full width half maximum spectral bandwidth that does not exceed 10 nm; and for locking-in the light adjustable lens by applying a lock-in radiation to photo-polymerize macromers that were not polymerized by the irradiating, thereby causing a wavelength-dependent wavefront sag to be within 10% of its maximum over an ultraviolet spectrum, wherein the wavefront sag is calculated from the equation: Sag = Δ(Dioptric Power) ∗ y 2 /2 wherein y is the radius of the refraction-change zone of the lens , and Δ(Dioptric Power) is the change in dioptric power from pre-irradiation to post-irradiation, measured in units of 1/length. an ultraviolet light source to generate an ultraviolet light; a light delivery system ; and a light adjustable lens , wherein the light adjustable lens is an intraocular lens which comprises photo-polymerizable macromers in a first polymer matrix, a photoinitiator, and a refraction-change zone having a radius; wherein the light delivery system is configured to irradiate the generated ultraviolet light onto the light adjustable lens when implanted in an optical system which is a human eye, with a center wavelength and with a spatial irradiance profile to photo-polymerize a portion of the photo-polymerizable macromers to change a dioptric power of the light adjustable lens by changing a refraction of the light adjustable lens in the refraction-change zone , and wherein the ultraviolet light source and the light delivery system are configured: for irradiating the light adjustable lens with the ultraviolet light having a center wavelength in a range of 370 nm to 390 nm, an average irradiance in a range of 1 mW/cm 2 to 50 mW/cm 2 and a full width half maximum spectral bandwidth that does not exceed 10 nm; and for locking-in the light adjustable lens by applying a lock-in radiation to photo-polymerize macromers that were not polymerized by the irradiating, thereby causing a wavelength-dependent wavefront sag to be within 10% of its maximum over an ultraviolet spectrum, wherein the wavefront sag is calculated from the equation: Sag = Δ(Dioptric Power) ∗ y 2 /2 wherein y is the radius of the refraction-change zone of the lens , and Δ(Dioptric Power) is the change in dioptric power from pre-irradiation to post-irradiation, measured in units of 1/length. <EOS>