Injongo yokuphuhlisa iilensi zokugxila ezikwindawo ene-Air-Spaced kukunciphisa ukuguquguquka nokufikelela kubukhulu obuncinci bebala. Iilensi zokugxila ezikwi-achromatic triplet zilungiswa ngombala; zombini i-laser beam esebenzayo kunye ne-inspection visible beam ziya kugxila kwindawo efanayo yokugxila okanye ezimbini ezikufutshane.
Ubude be-wavelength bugxile ekuboneleleni ngeemveliso zokukhanya ezichanekileyo kakhulu kangangeminyaka engama-20