Adaptive Optics for Autofocusing Eyeglasses

Hasan, Nazmul; Karkhanis, Mohit; Khan, Fariha; Ghosh, Tridib; Kim, Hanseup; Mastrangelo, Carlos H.

doi:10.1364/aio.2017.am3a.1

Cited by 16 publications

(11 citation statements)

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“…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

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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.

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Section: Introductionmentioning

confidence: 99%

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

et al. 2022

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“…Recent advances in adaptive optical systems 8 suggest that such smart eyewear systems can be implemented in lightweight form for eyeglasses and more recently, contact lenses configurations. These advances in adjustable-focus lens technologies and low-power electronic systems have facilitated the development of accommodation-correction devices like smart-eyeglasses, which can provide automatic accommodation and potentially restore near-normal vision in presbyopes 9–12 . Smart-eyeglasses consist of three main electronic components – sensors, embedded computing systems and adjustable focus lenses.…”

Section: Introductionmentioning

confidence: 99%

“…Smart-eyeglasses consist of three main electronic components – sensors, embedded computing systems and adjustable focus lenses. They use a host of sensors to determine the object distance 9,10,12 and the gaze (point of visual focus) of every eye 11,13 . Using this data, the embedded computing systems within these devices can near-instantaneously change the optical power of the adjustable-focus lenses by performing quick calculations which use real-time sensor data and electronically-stored accommodation data of the patient.…”

Section: Introductionmentioning

confidence: 99%

Models of Accommodation Deficiency in Presbyopia Patients

Karkhanis

Banerjee

Ghosh

et al. 2020

Preprint

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Purpose: We describe new phenomenological illumination-dependent static models of the accommodation deficiency for patients with presbyopia. Such models are suitable for vision restoration with adaptive-optics accommodating eyeglasses and contact lenses. Methods: Data from fifteen participants over the age of 45 and diagnosed with presbyopia was collected. Participants were asked to wear a pair of mechanically-tunable eyeglasses and clearly identify the optotypes corresponding to the LogMAR 0.0 line on Early Treatment of Diabetic Retinopathy Study (ETDRS) charts, by suitably adjusting the optical powers of the lenses on these tunable eyeglasses for each measurement. Seven ETDRS charts, placed at distances from the patients varying from 4 m through 30 cm, were used under three chart illumination levels (75 lx, 500 lx and 800 lx). The optical power of the lenses in the patient-adjusted tunable eyeglasses was subsequently measured using a Shack-Hartman wavefront sensor for each chart, which provided the accommodation deficiency data of the participants. Results: The measured accommodation deficiency data from 15 presbyopes was curve-fitted to a model for each patient. The calculated root-mean-square error values for the fitted models ranged between 0.09 D - 0.67 D over a 3.08 D accommodation stimulus range. Conclusions: The data shows that while accommodation deficiency in humans is a function of the stimulus, it is also strongly dependent on the object illumination and age of the patients. The models adequately describe the relation between static accommodation deficiency, accommodation stimulus and object illumination.

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“…The thrust of much of the work on larger lenses often involves improving the optical quality, speed, field of view, weight, power consumption, and focal range of the lenses. Some have gone further and incorporated these focustunable lenses into an eyeglass form factor (23)(24)(25)(26). While many of these require some form of manual control, Hasan et al (23,24) incorporate a single-pixel time-of-flight depth sensor to automatically update the lenses on the basis of what is directly in front of the wearer (a refocusing mechanism referred to from this point forward as "depth-tracked").…”

Section: Introductionmentioning

confidence: 99%

“…However, note that none of these focus-tunable corrections have been empirically evaluated or verified as outperforming traditional fixed-focus methods of correction when worn by presbyopes. Furthermore, none of these solutions, including that of Hasan et al (23), truly capture the accommodation behavior that younger people are used to: simply looking around and having focus seamlessly adjust. While the depth sensor is an important step, it still requires that a wearer move their head, not their eyes, to fixate on objects.…”

Section: Introductionmentioning

confidence: 99%

Autofocals: Evaluating gaze-contingent eyeglasses for presbyopes

2019

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As humans age, they gradually lose the ability to accommodate, or refocus, to near distances because of the stiffening of the crystalline lens. This condition, known as presbyopia, affects nearly 20% of people worldwide. We design and build a new presbyopia correction, autofocals, to externally mimic the natural accommodation response, combining eye tracker and depth sensor data to automatically drive focus-tunable lenses. We evaluated 19 users on visual acuity, contrast sensitivity, and a refocusing task. Autofocals exhibit better visual acuity when compared to monovision and progressive lenses while maintaining similar contrast sensitivity. On the refocusing task, autofocals are faster and, compared to progressives, also significantly more accurate. In a separate study, a majority of 23 of 37 users ranked autofocals as the best correction in terms of ease of refocusing. Our work demonstrates the superiority of autofocals over current forms of presbyopia correction and could affect the lives of millions.

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Adaptive Optics for Autofocusing Eyeglasses

Cited by 16 publications

References 1 publication

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

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

Models of Accommodation Deficiency in Presbyopia Patients

Autofocals: Evaluating gaze-contingent eyeglasses for presbyopes

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