Correcting Presbyopia With Autofocusing Liquid-Lens Eyeglasses

Karkhanis, Mohit; Ghosh, Chayanjit; Banerjee, Aishwaryadev; Hasan, Nazmul; Likhite, Rugved; Ghosh, Tridib; Kim, Hanseup; Mastrangelo, Carlos H.

doi:10.1109/tbme.2021.3094964

Cited by 7 publications

(5 citation statements)

References 103 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The Zernike coefficients of the VLCF system also indicated no significant change in aberration measurements before and after LC filling. The maximum difference in RMS wavefront aberrations before and after LC filling was measured to be 0.04 µm, which is significantly lower than the average RMS aberration of the human eye (0.3µm) [4], [7]. The offset lenses with appropriate optical power of 16.67 D were also similarly fabricated.…”

Section: Fabrication and Characterization Of Tunable Lens Stackmentioning

confidence: 99%

Refractive-type Varifocal Liquid-crystal Fresnel lenses for smart contacts

Banerjee¹,

Ghosh²,

Karkhanis³

et al. 2023

Preprint

View full text Add to dashboard Cite

We demonstrate the implementation of a low-power, low-profile, varifocal liquid-crystal Fresnel lens stack suitable for tunable imaging in smart contact lenses. The lens stack consists of a high-order refractive-type liquid crystal Fresnel chamber, a voltage-controlled twisted nematic cell, a linear polarizer and a fixed offset lens. The lens stack has an aperture of 4 mm and thickness is ~980 μm. The varifocal lens requires ~2.5 VRMS for a maximum optical power change of ~6.5 D consuming electrical power of ~2.6 µW. The maximum RMS wavefront aberration error was 0.2 µm and the chromatic aberration was 0.008 D/nm. The average BRISQUE image quality score of the Fresnel lens was 35.23 compared to 57.23 for a curved LC lens of comparable power indicating a superior Fresnel imaging quality.

show abstract

Section: Fabrication and Characterization Of Tunable Lens Stackmentioning

confidence: 99%

Refractive-type Varifocal Liquid-crystal Fresnel lenses for smart contacts

Banerjee¹,

Ghosh²,

Karkhanis³

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…A much better solution for restoration of accommodation is to utilize an external varifocal lens (VFL), which compensates for the accommodation loss at different object distances [2].…”

Section: Vision Restoration With Varifocal Lensesmentioning

confidence: 99%

Ultralow Power On-the-Eye Vergence and Distance Sensing Through Differential Magnetometry

et al. 2023

Self Cite

View full text Add to dashboard Cite

We demonstrate the realization of a very low energy, on-the-eye vergence-type distance ranger based on sensing of a locally-uniform vector field, specifically the earth's magnetic field. This ranging method is passive, only requiring measurement of the magnetic field vector at both eyeballs utilizing magnetometer chips placed on the eye scleral regions. The eye vergence angle and range distance are calculated from these two vector quantities. The method can obtain a range reading with as little as 118 nJ of energy consumed per eye for 3.3V and 50 nJ when operated at 1.9V. This method is thus suitable for applications where energy storage is very limited such as in smart contacts vision correcting microsystems.

show abstract

“…In practical terms, patient-specific AE models with low RMS errors will have to be programmed into autofocusing eyewear devices to avoid over-or under-compensation and avoid related deterioration in the vision of the presbyope. We have shown the implementation of one of the models in a recently published article which demonstrates the design and implementation of a pair of smart autofocusing, liquid-lens eyeglasses to mitigate presbyopia [13].…”

Section: A Impact Of Defocus Ae On Visual Acuitymentioning

confidence: 99%

“…Recent advances in adaptive optical systems [3]- [6] suggest that adaptive smart eyewear systems can be implemented in lightweight form and contact lens configurations [7], [8]. Autofocusing eyewear like smart-eyeglasses for example can provide automatic accommodation correction and potentially restore near-normal vision in presbyopes [5], [9]- [13]. Such devices hold great promise as they can potentially restore normal vison and improve the lives of billions of people affected by presbyopia.…”

Section: Introductionmentioning

confidence: 99%

Compact Models of Presbyopia Accommodative Errors for Wearable Adaptive-Optics Vision Correction Devices

et al. 2022

Self Cite

View full text Add to dashboard Cite

Subjective accommodation refractive error models are essential for implementing adaptive vision correction devices that utilize varifocal optics. This article describes compact empirical models of subjective accommodative refractive errors in subjects with advanced presbyopia. The models are based on measurements of subjective refractive errors from fifteen presbyopes over the age of 45 using commercially available focus-tunable eyeglasses under three different illumination conditions over a 3.08D accommodation stimulus range. The resulting average residual root-mean-squared (RMS) error values for the best fitting 8parameter model was 0.25D compared to an average RMS error of 0.4D for the conventional DDF and HHG models. The RMS error for the best-fitting model is below the average refractive error of the human eye.

show abstract

Correcting Presbyopia With Autofocusing Liquid-Lens Eyeglasses

Cited by 7 publications

References 103 publications

Refractive-type Varifocal Liquid-crystal Fresnel lenses for smart contacts

Refractive-type Varifocal Liquid-crystal Fresnel lenses for smart contacts

Ultralow Power On-the-Eye Vergence and Distance Sensing Through Differential Magnetometry

Compact Models of Presbyopia Accommodative Errors for Wearable Adaptive-Optics Vision Correction Devices

Contact Info

Product

Resources

About