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10 January, 2022
The MTFa is an objective in vitro MFT-based metric to assess the optical quality of an intraocular lens: the larger the MTFa value, the better the IOL optical quality.
The MTF is a metric at single spatial frequency.
Figure 1. LuxSmart™ experimental Through-focus MTF at 50 cycles/mm1
Figure 2. LuxSmart™ experimental Through-focus MTF for 2 mm pupil size for distance 0.0 D defocus (left) and intermediate +1.50 D defocus (right)1
For defocus values where the MTFa value is ≥ 12, the expected visual acuity would be around 0.2 logMAR (required for driving license).
For defocus values where the MTFa value is ≥ 20, the expected visual acuity would be around 0.0 logMAR.
So, in the example of Figure 3 of the LuxSmart™ premium IOL, we may predict around 2.3 D of useful range of vision with a visual acuity around 0.0 logMar for a pupil size of 2 mm. In the case of 3.0 mm pupil size we may predict a useful range of vision around 1.6 D and around 0.7 D for a pupil of 4.5 mm.
All measurements were made in agreement with the International Organization for Standardization (ISO) 11979-2 (2014) recommendations [ISO Standard].
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