toric lens वाक्य

Based in Cambridge, this office has developed various types of contact-lens technologies, including freeform surface modelling, toric lens design, and wavefront technologies, as well as lenses for persons suffering from keratoconus and corneal trauma.
To avoid phantom indications the design makes use of a special inverted toric lens ( i . e . a single clear Fresnel lens mounted step sides outwards ) with a portion of the lens steps painted black.
Some spherical rigid lenses can also correct for astigmatism . ( See below . ) Because a toric lens must have the proper orientation to correct for a person's astigmatism, such a CL must have additional design characteristics to prevent it from rotating away from the ideal alignment.