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Principle and visual performance of new presbyopia-correcting continuous transition focus intraocular lens

Poster Details

First Author: M.Choi SOUTH KOREA

Co Author(s):    Y. Yoo   W. Whang   J. Lee   Min-Ji   C. Joo        

Abstract Details


To objectively characterize the optical performance and halo of new presbyopia-correcting continuous transition focus (CTF) intraocular lens (IOL)


The optical bench system was set to evaluate the image quality against the USAF target and the headlight image for analyzing halo around the focused image.


This experimental study evaluated the new presbyopia-correcting CTF IOL using optical bench metrology system. Measurement included through-focus modulation transfer function (MTF) by 0.25 diopter steps, image quality at different pupil diameter, and the image quality degradation according to decentration and rotation of CTF IOL at far distance. MTF was calculated at 7.40 cycles per degree. To confirm the halo caused at the night vision, the headlight image for IOL was obtained from the white light (100 cd/m2) at far distance.


CTF IOL showed two peaks at 0 and 2.25 diopter defocus. Between 0 and 2.25 diopter defocus, the lowest image quality was found at 1.75 diopter defocus and the degradation rate at that point was calculated to 20.4% of the image quality at far distance. MTF at 2, 3, and 4 mm pupil diameter were 0.55, 0.56, 0.56 at far distance, respectively. When IOL were decentered by 1.0 mm and rotated by 90 degree, the image quality degradation rates were 3.5% and 0.2%. The halo intensity was 9.3% of the peak intensity at the central point in that image.


The gradual degradation of the image quality at intermediate distance, the independence for pupil diameter, the tolerance for decentration or rotation, and the faint halo would be advantage of CTF IOL.

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