Depth of field and visual performance after implantation of a new hydrophobic trifocal intraocular lens

Clinical Outcomes of a Bi-Aspheric Trifocal Diffractive Intraocular Lens

Purpose

To assess refractive and visual outcomes post-cataract surgery with bilateral implantation of a bi-aspheric diffractive trifocal intraocular lens (IOL).

Methods

A total of 24 patients who underwent bilateral implantation with the Asqelio Trifocal IOL TFLIO130C were evaluated at the 6 months postoperative mark. Key outcome measures included refractive error, photopic monocular and binocular uncorrected and corrected distance visual acuity (UDVA, CDVA), uncorrected and corrected intermediate visual acuity (UIVA, CDIVA) at 60 cm, and uncorrected and corrected near visual acuity (UNVA, CDNVA) at 40 cm. Additionally, monocular and binocular CDNVA were assessed under mesopic conditions. Monocular and binocular defocus curves, and binocular contrast sensitivity under photopic and mesopic conditions, with and without glare, were measured. Catquest-9SF and visual symptoms questionnaires were also administered.

Results

Postoperative average values of binocular logMAR photopic CDVA, photopic CDIVA, photopic CDNVA and mesopic CDNVA were -0.01±0.06, 0.03±0.09, 0.02±0.05 and 0.19±0.13, respectively. About 100% of patients showed cumulative CDVA and CDNVA ≥20/25, and CDIVA ≥20/32. The average absolute depth-of-focus was about 4.50D. The average postoperative spherical equivalent was 0.05±0.30D and 100% and 93.75% eyes were within ±1.00D and ±0.50D, respectively. Contrast sensitivity was either within or above normal levels under both photopic and mesopic conditions, both with and without glare, except for 12 cpd under mesopic conditions with glare where the mean falls just below the normal range. Questionnaires revealed that 87.5% of patients were either satisfied or very satisfied with their vision after the surgery, and higher percentages for no difficulty in performing different activities, ranging from 70.83% to 95.83%, were reported.

Conclusion

This study demonstrates that the bi-aspheric diffractive trifocal IOL yields very good visual performance across distances, fostering high satisfaction levels and minimal difficulties in daily activities.

Contrast Sensitivity and Patient Reported Outcomes After Bilateral Implantation of a Bi-Aspheric Hydrophobic Trifocal Diffractive Intraocular Lens

Purpose

To assess contrast sensitivity and patient reported outcomes after uncomplicated cataract surgery with a new bi-aspheric diffractive trifocal intraocular lens (IOL) implantation.

Methods

Twenty-five patients who underwent bilateral implantation with the Asqelio Trifocal TFLIO130C IOL (AST Products Inc., Billerica, MA, USA) were analyzed at 6 months post-surgery. Binocular contrast sensitivity with and without glare was measured under photopic conditions (85 cd/m²) and mesopic conditions (3 cd/m²). Patients were asked to complete the Catquest-9SF patient outcomes questionnaire and a visual symptoms questionnaire.

Results

Photopic contrast sensitivity values were either within or above normal levels without glare; when glare was induced, the mean sensitivity values dropped just below normal range. Mesopic contrast sensitivity values were above or within normal range both with and without glare, except for 12 cpd with glare, where the mean fell just below the normal range. Differences in binocular contrast sensitivity threshold values with and without glare were significant for all spatial frequencies tested under both photopic and mesopic conditions (p<0.05). The Catquest-9SF questionnaire outcomes showed that 88% of patients were either satisfied or very satisfied with their sight after the surgery, and in all cases, the results indicated no difficulty in performing different daily activities. The visual symptoms questionnaire indicated no relevant visual symptoms regarding frequency, intensity, or bothersomeness after implantation of the trifocal IOL.

Conclusion

This novel bi-aspheric diffractive trifocal IOL provides good contrast sensitivity outcomes under bright and dim lighting conditions. Patients were satisfied with the surgery, with no relevant visual symptoms.