Center thickness of a contact lenses is most influenced by the prescription. Contact lenses are arc or dome shaped that determines different thickness around a lens. Center thickness plays great role in contact lens tolerance as it directly affects oxygen permeability in circle contacts.
Since the strength of your prescription defines the center thick-ness; you must note that contact lenses with higher degree are thicker at the central point of the lenses. Thick circle lenses block oxygen permeability & create a feeling of discomfort. People who are strongly near-sighted should wear contact lenses with high water content.
Contact lens thickness varies from 0.04mm to 0.09mm whereas the ideal thickness is 0.06mm. Contact lenses that are less than 0.04 are ultra-thin whereas circle contacts with more than 0.09mm thickness are considered thick & are poor in oxygen transmission. Thin contact lenses possess high water count but they make your dryness worse if you suffer from dry eyes syndrome. Contact lenses with high degree of water content absorb tears from your eyes, so it is recommended to use lubricating drops when necessary. On the other hand, they also ensure high oxygen permeability which keeps your eyes comfortable. In case you suffer from dry eyes; get yourself a pair of contact lenses with 38% water content.
Other than the prescription it is the type of brand that affect the center thickness of the contact lenses. Continuing to wear your contact lenses past the expiry also affect the efficacy of colored contacts. Always toss your disposable contacts for better & schedule annual meet ups with your eye care provider.