Which points define the fitting triangle?

The fitting triangle is an important concept in ophthalmic dispensing, used to ensure that eyewear fits properly and comfortably on the face. Specifically, the fitting triangle is defined by the contact points of the eyeglasses with the wearer's head, which typically includes the top of the ears and the bridge of the nose.

These points are critical because they help in achieving an optimal fit, ensuring that the frames sit properly on the face without slipping or causing discomfort. By understanding the fitting triangle, dispensers can assess the alignment and positioning of the frames in relation to these key anatomical landmarks, which is essential for both visual acuity and comfort.

In contrast, the other options may pertain to aspects of frame measurement or fitting but do not accurately define the fitting triangle. For example, frame contact points on the table refer to how frames rest when not worn, rather than how they fit on the face. The method for frame straightness relates to ensuring the frame is symmetrical and aligned, which is an important aspect of fitting but not what defines the triangle itself. Therefore, the correct identification of the fitting triangle as being connected specifically to the top of the ears and the bridge of the nose is crucial for successful dispensing practices.