What fitting method is best used for a patient with Keratoconus?

The diagnostic fitting set is the best method for fitting contact lenses on a patient with keratoconus because it allows for a more customized approach to the individual's unique corneal shape. Keratoconus is characterized by thinning and conical shaping of the cornea, which can lead to irregular astigmatism and visual distortion.

Using a diagnostic fitting set, the practitioner can try different lens designs and combinations to determine which one provides the best fit and optimal visual acuity. This method offers the benefit of evaluating the patient's response to specific lenses in real-time, allowing for adjustments based on how well the lenses conform to the irregular surface of the cornea.

Other methods, such as K readings, rely on corneal curvature measurements and may not adequately accommodate the irregularities present in keratoconus. The guessing method lacks the precision and tailored fitting that is critical for this condition, while molded impressions may not provide the necessary level of adjustment and custom fit required by patients with varying degrees of corneal irregularity. Therefore, utilizing a diagnostic fitting set is the most effective strategy for achieving a successful contact lens fit in individuals with keratoconus.