PURPOSE: Chord Mu is a new reference marker to predict outcomes after multifocal intraocular lens (IOL) implantation. The relationship of chord mu with distance-corrected near visual acuity (DCNVA), the incidence of halos and glare, and patient satisfaction was assessed with near vision in patients implanted with a novel Full Range of Vision (FRoV) IOL.

METHODS: This study included 110 patients who underwent cataract surgery and FRoV IOL implantation (enVista Envy MX60EFH, Bausch and Lomb). The value of chord Mu was measured using IOLMaster (Zeiss). Data were divided into two groups based on the chord Mu threshold of 0.6 mm: Group 1 included eyes in which the Chord Mu was ≤0.6 mm and Group 2 included those in which the Chord Mu was >0.6 mm. The relationships of chord Mu with DCNVA and frequency, severity, and bothersomeness of glare and halo and satisfaction with near vision were assessed.

RESULTS: The data of 218 eyes were available for analysis. The GEE model demonstrated no statistically significant relationship between Chord Mu and DCNVA (p=0.7325). There were no differences in the frequency, severity, and bothersomeness with halos or glare between the two groups (all p>0.05). Logistic regression found that Chord Mu is not a predictor of severe response to frequency, severity, and bothersomeness of glare (odds ratio (OR)=0.016, p=0.3704) or halos (OR=1.393, p=0.8414). For patient satisfaction with near vision, the model suggested that subjects with a larger chord Mu are less likely to report poor satisfaction on the Near Activity Visual Questionnaire (odds ratio=0.003, p=0.0221).

CONCLUSION: Longer Chord Mu has been associated with poorer near-vision outcomes with multifocal IOL implantation. In the present study, however, we found no effect of chord mu on the distance-corrected near visual acuity outcomes, patient-reported frequency, severity, and bothersomeness of glare and halos, or satisfaction with near vision.