Certified Ophthalmic Assistant Practice Exam

How can intraocular lenses be classified?

1. By their color

2. By their weight

3. By position and method of fixation

4. By cost

The correct answer is: By position and method of fixation

Intraocular lenses (IOLs) are primarily classified based on their position in the eye and the method by which they are fixed in place. This classification is essential as it helps ophthalmologists determine which type of lens is most suitable for a patient based on their specific anatomical needs and the surgical technique being employed. Position classification typically refers to whether the lens is placed in the anterior chamber of the eye (anterior IOLs) or the posterior chamber (posterior IOLs), which has a significant impact on the visual outcomes and potential complications. The method of fixation can involve different techniques, such as the use of capsular bags or sutures, influencing both the stability of the lens and overall patient comfort. While color, weight, and cost may be important considerations in some contexts, they do not provide a primary basis for the clinical classification of IOLs. Instead, the clinical relevance of positioning and fixation methods plays a crucial role in the successful outcome of cataract surgery and lens implantation.