“…80 cm). In the same way -1.50 D, became -1.75 D and its corresponding viewing distance changed from 66.7 cm to 57.1 cm 13 , 19 .…”
Section: Methodsmentioning
confidence: 80%
“…1 presents the average distance-corrected binocular defocus curve of the patients. As explained before, an adjustment of the viewing distances for each negative lens presented to the patient was performed accounting for the 4 meters distance of the chart 13 , 19 . Fig.…”
Section: Resultsmentioning
confidence: 99%
“…On the other hand, it meant subjecting patients to a longer exam time, and consequently were not used. As explained by Gundersen and Potvin the corresponding viewing distances for each negative vergence magnitude evaluated during the defocus curve examination were adjusted accounting for the 4 meters chart distance 13 , 19 . Briefly, the principles of adjustment were as follows: since 4 meters charts were used, a patient corrected for this distance is not really being measured at infinity, and the vergence listed as “0” Diopters (D) on the graph was really of an amount of -0.25 D. So, the effective vergences from the defocus charts had to be adjusted in such magnitude.…”
“…80 cm). In the same way -1.50 D, became -1.75 D and its corresponding viewing distance changed from 66.7 cm to 57.1 cm 13 , 19 .…”
Section: Methodsmentioning
confidence: 80%
“…1 presents the average distance-corrected binocular defocus curve of the patients. As explained before, an adjustment of the viewing distances for each negative lens presented to the patient was performed accounting for the 4 meters distance of the chart 13 , 19 . Fig.…”
Section: Resultsmentioning
confidence: 99%
“…On the other hand, it meant subjecting patients to a longer exam time, and consequently were not used. As explained by Gundersen and Potvin the corresponding viewing distances for each negative vergence magnitude evaluated during the defocus curve examination were adjusted accounting for the 4 meters chart distance 13 , 19 . Briefly, the principles of adjustment were as follows: since 4 meters charts were used, a patient corrected for this distance is not really being measured at infinity, and the vergence listed as “0” Diopters (D) on the graph was really of an amount of -0.25 D. So, the effective vergences from the defocus charts had to be adjusted in such magnitude.…”
“…These lenses were inserted into a test frame to account for the manifest error in the refraction of the distance. The measurement was carried out with ETDRS charts at 6 m in mesopic light conditions [14,15].…”
Background
Recently, a new presbyopia-correcting intraocular lens (IOL) that combines extended depth-of-focus and bifocal profiles (ZFR00: Tecnis® Synergy®, Johnson & Johnson Vision, Santa Ana, CA, USA) has been established and several studies have been reported. We attempted to compare the performance with a standard IOL (ZCB00: Tecnis® monofocal, Johnson & Johnson Vision, Santa Ana, CA, USA) manufactured using the same material from the same company, which has been extensively used worldwide.
Methods
The medical records of patients undergoing cataract surgery with ZCB00 or ZFR00 implantation between March 2021 and September 2021 and with available 3-month visit data were reviewed. Uncorrected near, intermediate, and distance visual acuity (VA), corrected distance VA, and optical quality were the main outcome measures.
Results
This study included forty-six patients (64 eyes), with twenty-one patients (32 eyes) implanted with ZCB00 and twenty-five patients (32 eyes) implanted with ZFR00. The average age of the patients was 66.0 ± 10.1 (range: 40 to 82) and 65.1 ± 4.7 (range: 59 to 77) years in the ZCB00 and ZFR00 groups, respectively. The preoperative characteristics did not differ significantly between the two groups. Compared to the ZCB00 group, the ZFR00 group demonstrated significantly superior intermediate and near VA (p < 0.001) at 3 months postoperatively. The ZFR00 group showed significantly lower objective measured optical quality than that in the ZCB00 group.
Conclusions
The ZFR00 exhibited a continuous range of vision and a smooth defocus curve, while the ZCB00 provided superior objective optical quality.
“…10,41 For example, light coming from an object viewed from 4 m will have a vergence of -0.25 D on reaching the eye; therefore, subsequent tested vergences of -1.00 D, -1.50 D, and -2.00 D will produce simulated distances of approximately 80 cm, 60 cm, and 45 cm, respectively, as opposed to 1 m, 66 cm, and 50 cm, respectively, if only taking into consideration the formula for focal length. 7,10,41 By this rationale, defocus curve testing performed at a viewing distance of 6 m would have less of a negative vergence discrepancy than if performed at 4 m. Regardless of the viewing distance at which the defocus curve assessment is performed, it is important to ensure that the starting point for defocus curve testing at a specific viewing distance is based on the manifest refraction at that distance. This will ensure any subsequent defocus induced is based on the patient's best refractive status at that viewing distance.…”
A comprehensive review of defocus curves for visual performance evaluation of multifocal and EDOF presbyopia-correcting IOLs highlighting key factors influencing both generation of results and data interpretation.
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