"optical improvement" is a correct and usable phrase in written English.
It generally refers to an action or process designed to improve the appearance of something (often an object or space). For example, you might say, "With the addition of some new furniture, we made some optical improvements to the living room."
Instrument miniaturisation, endoillumination and optical improvements have changed and will continue to strongly influence the way in which surgery is performed.
Serial intravitreal injections of triamcinolone resulted in restoration of photoreceptor anatomy on optical coherence tomography and visual improvement.
Heintzmann, R., Jovin, T. M. & Cremer, C. Saturated patterned excitation microscopy a concept for optical resolution improvement.
UV vis and X-ray absorption spectroscopic techniques were employed for investigating the mechanism behind the optical quality improvement of the ruby.
The relative optical efficiency improvement of this design was studied in detail though a combination of theory, numerical simulation, and experimentation.
In a previous study, 9 we indicated that a set of halometric examination data at red and green targets would indicate that the condition of optical changes (improvement or deterioration) is related rather to the lens than the cornea.
This seed layer guaranteed a well-defined orientation and alignment of the grown nanostructures, as well as optical property improvements due to their very low roughness and small particle size.
Scherler, D., Leprince, S. & Strecker, M. R. Glacier-surface velocities in alpine terrain from optical satellite imagery accuracy improvement and quality assessment.
But, for the in-vessel diagnostics in the visible range optical spectroscopy, further improvement of the radiation resistance of optical fibers will be needed.
