OPHTHALMOMETER MEASURING TECHNIQUE

Appearance of Mires with Corneal Toricity


With high amounts of corneal 
toricity the normally round 
mires will appear oval since 
the radii in the two meridians 
are quite different.  The 
steeper meridian gives a 
smaller mire image (narrow 
portion of the oval) and the 
flatter meridian gives a 
larger mire image (long axis 
of the oval).