LID POSITION DETERMINATION


One should record the position of the 
lid margins with respect to the limbus.  
This is often more important than actual 
palpebral aperture measurement in 
determining the lens type and diameter 
to be used.

Estimate the coverage of the upper part 
of the cornea by the upper lid in mm.  If 
it covers some of the cornea, for 
example 2 mm, then it should be recorded 
as +2.  If the upper lid is above the upper 
limbus, for example by 1 mm, than it 
should be recorded as -1.

Likewise if the lower lid covers 1 mm of 
the lower cornea it would be recorded as +1.  If it is below the lower limbus by 2 mm, it would be recorded as -2.