Which fitting process involves placing diagnostic lenses on the eye and uses information from the pre-fit examination?

Which fitting process involves placing diagnostic lenses on the eye and uses information from the pre-fit examination?

• A. Hybrid fitting
• B. Topographical fitting
• C. Empirical fitting
• D. Diagnostically fitting

Answer: (D)

Diagnostic fitting focuses on testing how a lens actually sits on the eye by using trial lenses. After the pre-fit exam collects measurements such as keratometry, corneal shape, and other anatomic factors, the clinician places diagnostic lenses on the eye to see how they align with the cornea in real life. This on-eye trial reveals whether the lens centers well, how it moves with each blink, and how the tear film interacts under the lens. Observing the fluorescein pattern helps determine if the base curve is too steep or too flat and whether the edge is lifting or binding. The pre-fit information guides which diagnostic designs to try and what to tweak—base curve, diameter, or edge characteristics—so vision is steady, comfort is good, and corneal health is preserved before finalizing the lens parameters.

Diagnostic fitting focuses on testing how a lens actually sits on the eye by using trial lenses. After the pre-fit exam collects measurements such as keratometry, corneal shape, and other anatomic factors, the clinician places diagnostic lenses on the eye to see how they align with the cornea in real life. This on-eye trial reveals whether the lens centers well, how it moves with each blink, and how the tear film interacts under the lens. Observing the fluorescein pattern helps determine if the base curve is too steep or too flat and whether the edge is lifting or binding. The pre-fit information guides which diagnostic designs to try and what to tweak—base curve, diameter, or edge characteristics—so vision is steady, comfort is good, and corneal health is preserved before finalizing the lens parameters.