Certified Paraoptometric (CPO) Practice Exam 2025

Which lenses are commonly used on a disposable replacement schedule?

1. Rigid

2. Soft

3. Custom-fitted

4. Orthokeratology

The correct answer is: Soft

Soft contact lenses are commonly used on a disposable replacement schedule because they are designed for single-use or short-term wear. This includes daily disposables, bi-weekly, or monthly disposables that provide convenience to the user while minimizing the risk of complications associated with longer wear schedules. Soft lenses are made of flexible materials that allow oxygen to reach the cornea, making them comfortable for daily use and suitable for frequent replacement. Other types of lenses, such as rigid lenses, tend to be used for longer periods and are not generally disposable. Custom-fitted lenses are tailored to the individual, often requiring a more extended wear schedule to ensure proper fit and function. Orthokeratology lenses are also used for vision correction but typically require overnight wear and are not intended for a disposable replacement schedule, as they are designed for longer-term use to reshape the cornea gradually.