The use of video-keratoscopy in predicting contact lens parameters for keratoconic fitting

RGP contact lens fitting in keratoconus using FITSCAN technology

“…Ultimately contact lens fitting in keratoconus becomes a complex procedure that necessitates longer chair time and multiple diagnostic fitting trials. There are reports on the selection of contact lens base curve based on corneal topography indices [9][10][11][12][13]22] and mostly the parameter selection is based on clinician's experience. The FITSCAN RGP fitting software utilises the anterior elevation data that represents the actual representation of the anterior corneal surface, to produce the fluorescein maps and hence thought to be a better tool in the selection of the contact lens parameters in keratoconus.…”

“…The FITSCAN by default calculates the lens diameter as 8.8 mm but in the diagnostic fit the selection of the diameter depends on the morphology and location of the cone [9] and on lens thickness and lid position. But the clinician can alter the diameter to achieve a better fluorescein pattern.…”

“…The role of FITSCAN in RGP contact lens fitting had been reported earlier [9,17]. Bhatoa et al compared FITSCAN calculated RGP contact lens parameters with patients habitual contact lens parameters in keratoconus patients and found poor to moderate agreement between the FITSCAN calculated and patient habitual contact lens parameters.…”

“…A trial lens (diagnostic) fitting approach is often necessary to achieve an acceptable contact lens fit in keratoconus patients and often multiple trials are required [6,7]. The corneal topography is an important tool in the management of keratoconus and it guide in the parameter selection of the initial trial lens [8][9][10][11][12][13][14][15].…”

Contact lens in keratoconus

“…[67] A trial lens (diagnostic) approach is necessary to achieve an acceptable contact lens fit in keratoconus patients. [8] But as the severity of keratoconus increases, the corneal apex become steeper and fitting the contact lens becomes more challenging.…”