Our findings showed that mismatching the CL-SAG and the OC-SAG results in an inappropriate lens fit. Specifically, fitting high–CL-SAG lenses to low–OC-SAG eyes and vice versa leads to a poor fit. As we know, a poor fit may be associated with lens discomfort, dissatisfaction or significant adverse reactions such as corneal infiltrative events.
Dropouts & Lens Fit
Another presentation by James Chung and Melissa Bailey revealed that patients with presbyopia who drop out of contact lens wear have an OC-SAG that is different from that of successful presbyopic contact lens wearers. Melissa, Eef and their colleagues also presented a poster indicating that soft contact lens movement with a blink may not be a strong indicator of relative OC-SAG and lens fitting.
These findings, coupled with previously published research, suggest that achieving a 'successful' soft contact lens fit for all patients remains a challenge, even for our regular spherical or toric lens wearers. A good lens fit is crucial for prolonged contact lens wear, maximum comfort and patient confidence. However, one-third of patients show signs of dissatisfaction within three months of starting contact lens wear, with variations depending on region and lens type.