Spherical refractive correction with an electro-optical liquid lens in a double-pass system

Sanabria, Ferran; Díaz-Doutón, Fernando; Aldaba, Mikel; Pujol, Jaume

doi:10.2971/jeos.2013.13062

Cited by 15 publications

(26 citation statements)

References 11 publications

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“…The suitability of the EOLL as a spherical compensator has been demonstrated and the spherical compensator characterized in a previous study. 22 The errors due to curvature and consequent thickness changes in the EOLL when varying the focal length were studied in the mentioned work, concluding that are negligible when measuring the optical quality of the eye.…”

Section: Instrumentationmentioning

confidence: 86%

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Technical improvements applied to a double-pass setup for performance and cost optimization

et al. 2014

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Abstract. We have studied the possibility of improving the performance, simplifying, and reducing the cost of a double-pass system by the use of alternative technologies. The system for correcting the spherical correction has been based on a focusable electro-optical lens, and a recording device based on CMOS technology and a superluminescent diode (SLED) light source have been evaluated separately. The suitability of the CMOS camera has been demonstrated, while the SLED could not break the speckle by itself. The final experimental setup, consisting of a CMOS camera and a laser diode, has been compared with a commercial double-pass system, proving its usefulness for ocular optical quality and scattering measurements.

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Section: Instrumentationmentioning

confidence: 86%

“…Recently, an alternative for spherical correction based on focusable electro-optical lenses (EOLL) has been proposed. 22 These lenses consist of an optical fluid covered by an elastic membrane. The curvature of the EOLL changes when a current is applied, modifying the spherical power of the lens.…”

Section: Introductionmentioning

confidence: 99%

Technical improvements applied to a double-pass setup for performance and cost optimization

et al. 2014

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“…Changes in the orientation between the cylindrical lenses forming the set C 1−2 permits compensations for astigmatism of the eyes under assessment [26]. The focus tunable lens L T is used in combination with the lens of fixed optical power L C to compensate for defocus [27]. The prism mirrors M 1 and M 3 are used to separate or join the optical path of the light going to or coming from the left and right eyes.…”

Section: Response For Scattering In Young Healthy Eyesmentioning

confidence: 99%

Response for light scattered in the ocular fundus from double-pass and Hartmann–Shack estimations

et al. 2016

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Double-pass (DP) and Hartmann-Shack (HS) are complementary techniques based on reflections of light in the ocular fundus that may be used to estimate the optical properties of the human eye. Under conventional data processing, both of these assessment modes provide information on aberrations. In addition, DP data contain the effects of scattering. In the ocular fundus, this phenomenon may arise from the interaction of light with not only the retina, but also deeper layers up to which certain wavelengths may penetrate. In this work, we estimate the response of the ocular fundus to incident light by fitting the deviations between DP and HS estimations using an exponential model. In measurements with negligible intraocular scattering, such differences may be related to the lateral spreading of light that occurs in the ocular fundus due to the diffusive properties of the media at the working wavelength. The proposed model was applied in young healthy eyes to evaluate the performance of scattering in such population. Besides giving a parameter with information on the ocular fundus, the model contributes to the understanding of the differences between DP and HS estimations.http://dx

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“…The light is compensated first for astigmatism using C 1−2 by controlling the angle between two identical ophthalmic lenses of S = +1D and C = −2D in spherical and astigmatic prescription [20]. The commercially available remote-controlled focus-tunable lens L T (Optotune EL-10-30-NIR-LD, f ≈ 45 − 120mm) is used in combination with lens L C of fixed focal length ( f = 75mm) to compensate for spherical refractive errors [21]. The distance between lenses L T and L C and between L C and the pupil plane is twice the focal distance of lens L C , so that L T is also in a plane conjugated to the pupil of the eye.…”

Section: A Apparatusmentioning

confidence: 99%

Binocular open-view system to perform estimations of aberrations and scattering in the human eye

et al. 2015

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We present a system that integrates a double-pass (DP) instrument and a Hartmann-Shack (HS) wavefront sensor to provide information not only on aberrations, but also on scattering occurring in the human eye. A binocular open-view design permits evaluations in normal viewing conditions. Furthermore, the system is able to compensate for both spherical and astigmatic refractive errors during measurements by using devices with configurable optical power. The DP and HS techniques provide comparable data after estimating wavefront slopes with respect to intersections of an ideal grid and compensating for residual errors provoked by optical defects of the measuring system. Once comparable data is obtained, it is possible to use this combined manner of assessment to provide information on scattering. Measurements in an artificial eye suggest that the characteristics of the ocular fundus may induce deviations of DP with respect to HS data. These differences were quantified in terms of the modulation transfer function in young healthy eyes measured in infrared light to demonstrate the potential use of the system in visual optics studies.

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Spherical refractive correction with an electro-optical liquid lens in a double-pass system

Cited by 15 publications

References 11 publications

Technical improvements applied to a double-pass setup for performance and cost optimization

Technical improvements applied to a double-pass setup for performance and cost optimization

Response for light scattered in the ocular fundus from double-pass and Hartmann–Shack estimations

Binocular open-view system to perform estimations of aberrations and scattering in the human eye

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