Optical inspection of single vision soft contact lenses based on an active adaptive wavefront sensor

Rania M. Abdelazeem; Mostafa Agour

doi:10.1364/AO.441289

Applied Optics
Vol. 61,
Issue 1,
pp. 141-148
(2022)
•https://doi.org/10.1364/AO.441289

Optical inspection of single vision soft contact lenses based on an active adaptive wavefront sensor

Rania M. Abdelazeem and Mostafa Agour

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Rania M. Abdelazeem and Mostafa Agour, "Optical inspection of single vision soft contact lenses based on an active adaptive wavefront sensor," Appl. Opt. 61, 141-148 (2022)

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Abstract

We present an experimental configuration for optical inspection of single vision soft contact lenses based on an active adaptive wavefront sensor. At first, the soft lenses were immersed in a saline filled wet cell to prevent surface deformation during measurements. Thereafter, refractive powers and aberrations were accurately measured before and after correcting illumination laser beam aberrations and wet cell-induced aberrations. The results reveal that there is a significant difference between the measured aberrations and refractive powers before and after aberration compensation. Accordingly, the proposed system is recommended as an optical inspection tool for precise assessment of commercially available contact lenses.

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Data Availability

The data underlying the results presented in this paper are available from the corresponding author upon request.

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Manufacturer	Material	Country	$n_{L}$	D (mm)	BC (mm)	Water Content
Bausch & Lomb	hilafilcon B	Ireland	1.4036	14.20	8.60	59%
Biomedics	ocufilcon D	USA	1.4300	14.20	8.60	55%

Lens	$f$ (mm)	$P_{I}$	$P_{m} (b c)$	$σ_{bc}$	$P_{m} (a c)$	$σ_{ac}$
Plano–convex	250	−4	−3.786	5.35%	−4.069	1.73%
Plano–convex	400	−2.5	−2.196	12.16%	−2.578	3.12%
Plano–convex	500	−2	−1.650	17.50%	−2.062	3.10%
Averaged				11.67%		2.65%

Zernike		Measured Value (µm)
Coefficient	Description	$b c$	$a c$
$Z_{1}$	Piston	−0.098	0.017
$Z_{2}$	Tip $Y$	−0.018	0.002
$Z_{3}$	Tilt $X$	−0.026	0.046
$Z_{4}$	Astigmatism 45°	−0.006	−0.006
$Z_{5}$	Defocus	0.103	0.088
$Z_{6}$	Astigmatism 0°	0.069	−0.058
$Z_{7}$	Trefoil $Y$	−0.027	−0.020
$Z_{8}$	Coma $X$	0.014	0.005
$Z_{9}$	Coma $Y$	0.017	−0.033
$Z_{10}$	Trefoil $X$	0.005	−0.040
$Z_{11}$	Tetrafoil $Y$	−0.001	−0.001
$Z_{12}$	Secondary Astigmatism $Y$	0.003	0.012
$Z_{13}$	3rd-order spherical aberration	−0.019	0.002
$Z_{14}$	Secondary Astigmatism $X$	0.013	−0.010
$Z_{15}$	Tetrafoil $X$	−0.030	0.006
PV Value		1.932	2.382
RMSE		0.342	0.473

Contact Lens	$P_{w e t} (b c)$	$P_{a i r} (b c)$	$P_{w e t} (a c)$	$P_{a i r} (a c)$
Hilafilcon B	−0.2738	−1.6700	−0.2435	−1.4852
	−0.2766	−1.6871	−0.2448	−1.4931
	−0.3901	−2.3794	−0.3279	−1.9999
	−0.4035	−2.4611	−0.3398	−2.0726
Ocufilcon D	−0.3694	−1.7113	−0.3327	−1.5413
	−0.3703	−1.7155	−0.3342	−1.5483
	−0.4829	−2.2372	−0.4474	−2.0720
	−0.4897	−2.2687	−0.4526	−2.0960

Manufacturer	Material	Country	$n_{L}$	D (mm)	BC (mm)	Water Content
Bausch & Lomb	hilafilcon B	Ireland	1.4036	14.20	8.60	59%
Biomedics	ocufilcon D	USA	1.4300	14.20	8.60	55%

Abstract

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Equations (9)

Applied Optics