Design of double-zone aspheric diffractive intraocular lens with extended depth of focus

Fig. 2. MTF of the pseudophakic model eye under a 3 mm pupil at nine object locations for (a) 0° FOV and (b) 5° FOV. The MTF values are the average of tangential and sagittal directions.

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Fig. 3. Simulated 20/20 Snellen E optotypes of the model eye under a 3 mm pupil implanted with (a) the designed IOL and (b) a 22 D monofocal IOL for a 1.5 D object vergence.

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Fig. 4. MTF at 50 c/mm of the pseudophakic model eye for 0° FOV as a function of the pupil diameter at five object locations.

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Fig. 5. MTF of the pseudophakic model eye in polychromatic light for (a) 0° FOV and (b) 5° FOV at nine object locations under the 3 mm pupil. The MTF values are the average of tangential and sagittal directions.

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Fig. 6. MTF of five pseudophakic model eyes with different corneal aspherical coefficients at (a) 25 c/mm and (b) 50 c/mm as a function of the object distance for a 3 mm pupil and 0° FOV. The aspherical coefficient of the designed model eye is −0.18.

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$Profile of the manufactured double-zone aspheric diffractive IOL.$

Fig. 7. Profile of the manufactured double-zone aspheric diffractive IOL.

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Fig. 8. Trioptics-OptiSpheric^® IOL equipment for the IOL testing according to the EN/ISO 11979 standard: (a) setup, (b) schematic.

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Fig. 9. USAF test charts at several focal positions of the manufactured IOL for (a) a 3 mm pupil and (b) a 4.5 mm pupil obtained from the Trioptics-OptiSpheric^® IOL setup.

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$MTF at several focal positions of the manufactured IOL for (a) a 3 mm pupil and (b) a 4.5 mm pupil obtained from the Trioptics-OptiSpheric® IOL setup. The higher line in each image is the diffraction-limited MTF. The labeled values at the bottom of each image are the relative positions of the focal planes.$

Fig. 10. MTF at several focal positions of the manufactured IOL for (a) a 3 mm pupil and (b) a 4.5 mm pupil obtained from the Trioptics-OptiSpheric^® IOL setup. The higher line in each image is the diffraction-limited MTF. The labeled values at the bottom of each image are the relative positions of the focal planes.

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Fig. 11. Instrument of the Taylor Hobson^® Form Talysurf.

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Fig. 12. IOL surface profile error obtained from the Taylor Hobson Form Talysurf (the surface sag of the manufactured IOL minus the surface sag of the designed IOL).

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Fig. 13. Manufactured IOL profile obtained from the Olympus IX71 microscope (part of the IOL). The theoretical radial coordinates of the first, second, and third rings are r1 = 0.963291 mm, r2 = 1.659442 mm, and r3 = 1.739161 mm, respectively.

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Table 1. Structural Parameters of the Model Eye

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Table 1. Structural Parameters of the Model Eye

Component	Radius (mm)	Conic	Thickness (mm)	Refractive Index
Anterior cornea	7.8	$- 0.18$	0.5	1.376
Posterior cornea	6.6	$- 0.07$	3.5	1.336
Pupil	Infinity	0	0	1.336
Anterior IOL	–	–	–	1.494
Posterior IOL	–	–	–	1.336
Retina	$- 12.5$	–	–	–

Table 2. Parameters of the Inner Zone (r≤A1) of the IOL Surfaces

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Table 2. Parameters of the Inner Zone (r≤A1) of the IOL Surfaces

Parameter	Anterior Surface	Posterior Surface
Radius	9.709587372	$- 27.3461964$
Conic	$- 28.4118202$	$- 238.540327$
$α_{12}$	$- 3.512 \times 10^{- 3}$	$- 4.000 \times 10^{- 3}$
$α_{13}$	$9.2693 \times 10^{- 3}$	$8.7584 \times 10^{- 3}$
$α_{14}$	$3.3409 \times 10^{- 4}$	$3.0958 \times 10^{- 4}$
$α_{15}$	$- 5.673 \times 10^{- 4}$	$- 5.760 \times 10^{- 4}$

Table 3. Parameters of the Outer Zone (A1
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Table 3. Parameters of the Outer Zone (A1
Parameter Anterior Surface Posterior Surface
Radius $- 8.284 \times 10^{32}$ $9.8627 \times 10^{22}$
Conic $6.4209 \times 10^{28}$ $- 7.770 \times 10^{20}$
$α_{22}$ $- 0.04177115$ $8.9829 \times 10^{- 3}$
$α_{23}$ 0.022429863 $- 3.600 \times 10^{- 3}$
$α_{24}$ $- 3.545 \times 10^{- 3}$ $3.3071 \times 10^{- 4}$
$α_{25}$ $1.7654 \times 10^{- 4}$ $- 9.637 \times 10^{- 6}$

Table 4. Diffractive Phase Coefficients of the Inner Zone (r≤A1) of the IOL Anterior Surface
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Table 4. Diffractive Phase Coefficients of the Inner Zone (r≤A1) of the IOL Anterior Surface
Inner Zone of the IOL Anterior Surface Diffractive Phase Coefficients
$β_{11}$ $- 10.1338089$
$β_{12}$ $- 92.4055217$
$β_{13}$ 235.7040698
$β_{14}$ $- 152.264561$
$β_{15}$ $- 0.95913561$

Table 5. Diffractive Rings of the Inner Zone (r≤A1) of the IOL Anterior Surface
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Table 5. Diffractive Rings of the Inner Zone (r≤A1) of the IOL Anterior Surface
Cycles (m) $- 1$ $- 2$ $- 3$
Radius (mm) 0.963291 1.659442 1.739161

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Yayan Bian, Yongji Liu, Lai Jiang, "Design of double-zone aspheric diffractive intraocular lens with extended depth of focus," Chin. Opt. Lett. 16, 093301 (2018)

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