FITTING OF CONTACT LENS
If patient is a beginner, she must be given a trial of contact lens.
Different types of fittings
1. Alignment fitting:
This is the ideal fitting in which contact lens floats on precorneal tear film.
There is neither pooling of dye (tears) anywhere nor the contact lens touches the cornea.
Movements of contact lens with each blink are sufficient enough to enable tear exchange required by cornea.
2. Steep (Tight) fitting:
Here the contact lens touches the cornea at periphery and there is pooling of dye (tears) at the center of cornea.
Contact lens shows very little movement with each blink so that tear exchange is inadequate and cornea is at risk of hypoxia However, due to very little movement patient feels quite comfortable immediately after wearing contact lens but starts having problem after some time due to hypoxia.
Steep fitting is dangerous and should be avoided.
3. Flat (Loose) fitting:
Here the contact lens touches the cornea at centre and there is pooling of tears at the periphery.
Movements of contact lens on cornea are more than normal. There is adequate tear exchange and no risk of hypoxia at all.
However excessive movements of contact lens give foreign body sensation and patient feels uncomfortable and takes more time to adjust with lenses.
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Contact lens