COMPUTERIZED VIDEOKERATOSCOPES

Limitations and Sources of Error:    Area of the Cornea Measured

The clinician must realize that many of the instruments are limited to measuring the central 8 mm or so of the cornea.  This limits the usefulness with respect to fitting of contact lenses or evaluating why a lens may move more or less on a particular cornea.  Some of the instruments make assumptions about the corneal shape beyond the points actually measured when displaying the data or calculating a contact lens design or fluorescein pattern.