What classification do Contact Lenses have?

Contact Lenses Classification and Characteristics:

1. Material characteristics: soft (cellophane-like) or rigid (formed flexible plastic).

2. Wear schedule: Daily Wear or Overnight Wear (also called "Extended Wear", amodality which has fallen into disfavor because of the high incidence ofcomplications).

3. Life-span of the lens: Disposable (1 day or 2 week), Planned Replacement (1 month, 3 month or 6 month), or Conventional year or 2 year).

4. Correction modality: Spherical, Toric or Astigmatic, or Bifocal