Electrically variable liquid crystal lenses for ophthalmic distance accommodation

Galstian, Tigran; Asatryan, K. E.; Presniakov, Vladimir; Zohrabyan, Armen

doi:10.1364/oe.27.018803

Cited by 25 publications

(6 citation statements)

References 23 publications

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“…Perhaps one emerging approach that may gain further traction can be seen in work using graphene-based compound eyes inspired by vertebrates 174 that allow programmable and remote focusing of crystalline lens-shaped lenslet arrays. 175 Although these remain laboratory studies, whether triggered by the environment, an applied voltage and/ or the response of the autonomic nervous system to a proximal, blurred stimulus, such tuneable devices could mimic ocular accommodation with fast and accurate changes in lens curvature and size, resulting in a corresponding increase in the eye’s dioptric power. Whether such devices could be used as implanted or worn optical appliances with adequate image quality, an acceptable focal range, and a wide field of view remains untested.…”

Section: Discussionmentioning

confidence: 99%

New insights in presbyopia: impact of correction strategies

2023

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Presbyopia occurs when the physiologically normal age-related reduction in the eyes focusing range reaches a point, when optimally corrected for distance vision, that the clarity of vision at near is insufficient to satisfy an individual’s requirements. Hence, it is more about the impact it has on an individual’s visual ability to function in their environment to maintain their lifestyle than a measured loss of focusing ability. Presbyopia has a significant impact on an individual’s quality of life and emotional state. While a range of amelioration strategies exist, they are often difficult to access in the developing world and prescribing is generally not optimal even in developed countries. This review identified the need for a standardised definition of presbyopia to be adopted. An appropriate battery of tests should be applied in evaluating presbyopic management options and the results of clinical trials should be published (even if unsuccessful) to accelerate the provision of better outcomes for presbyopes.

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Section: Discussionmentioning

confidence: 99%

New insights in presbyopia: impact of correction strategies

2023

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“…Liquid crystal is a birefringent material that is powerful enough for the modulation of polarization. With the features of controllable birefringence and refractive indices, liquid crystal has been applied in various fields, such as displays [5], ophthalmic optics [6][7][8], beam shaping [9][10][11], and bio-sensors [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Diffraction and Polarization Properties of Electrically–Tunable Nematic Liquid Crystal Grating

Huang

Kang

et al. 2020

Polymers

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This work demonstrates an electrically-tunable nematic liquid crystal (NLC) diffraction grating with a periodic electrode structure, and discusses the polarization properties of its diffraction. The efficiency of the first-order diffraction can be gradually controlled by applying external electric fields cross the NLC, and the maximum diffraction efficiency of the first-order diffraction that can be obtained is around 12.5% under the applied voltage of 5.0 V. In addition to the applied electric field, the efficiency of the first-order diffraction can also vary by changing the polarized state of the incident beam. Antisymmetric polarization states with symmetrical intensities in the diffractions corresponding to the +1 and −1 order diffraction signals are also demonstrated.

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“…The field of LC-tunable lenses is very active at the moment 25 , 26 , as they can be used in ophthalmic applications 27 – 29 , mobile phones 30 , autostereoscopic devices 31 , 32 , plenoptic capture systems 33 , 34 , virtual reality displays 35 , to name some key enabled applications. In recent years, numerous structures have been proposed, e.g., by using curved electrodes 36 , 37 , built-in dielectric layers 38 – 40 , multielectrodes 41 – 44 and modal lenses 27 , 30 , 45 , 46 . Some disadvantages of curved electrodes and dielectric layers are the high required voltages due to the distance of the electrode to the LC layer.…”

Section: Introductionmentioning

confidence: 99%

A high birefringence liquid crystal for lenses with large aperture

Bennis

Jankowski

Strzeżysz

et al. 2022

Sci Rep

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This work presents the application of an experimental nematic liquid crystal (LC) mixture (1929) in a large aperture lens. The LC material is composed of terphenyl and biphenyl derivatives compounds with an isothiocyanate terminal group and fluorinated lateral substituents. The substitution with a strongly polar isothiocyanate group and an aromatic rigid core provides $$\pi$$ π -electron coupling, providing high birefringence ($$\Delta n = 0.3375$$ Δ n = 0.3375 at 636 nm and 23 °C) and low viscosity ($$\eta$$ η = 17.03 mPa s). In addition, it also shows high values of birefringence at near infrared (0.318 at 1550 nm). The synthesis process is simple when comparing materials with high melting temperatures. The excellent properties of this LC mixture are demonstrated in a large aperture LC-tunable lens based on a transmission electrode structure. Thanks to the particular characteristics of this mixture, the optical power is high. The high birefringence makes this LC of specific interest for lenses and optical phase modulators and devices, both in the visible and infrared regions.

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Electrically variable liquid crystal lenses for ophthalmic distance accommodation

Cited by 25 publications

References 23 publications

New insights in presbyopia: impact of correction strategies

New insights in presbyopia: impact of correction strategies

Diffraction and Polarization Properties of Electrically–Tunable Nematic Liquid Crystal Grating

A high birefringence liquid crystal for lenses with large aperture

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