Optical design and tolerancing of an ophthalmological system

Sieber, Ingo; Martin, Thomas; Yi, Allen Y.; Rübenach, Olaf

doi:10.1117/12.2060643

Cited by 6 publications

(6 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“… Computer Aided Design (CAD) model of one of both identical lens parts of the AH optics with alignment structures indicated [ 1 ]. …”

Section: Figurementioning

confidence: 99%

“… Optical micromachine and its components: Tunable freeform optics, silicon linkage, and piezoelectric stack actuator [ 1 ]. Left : contracted actuator and accommodated state, right : expanded actuator and disaccommodated state of the optics.…”

Section: Figurementioning

confidence: 99%

“… Precision-molded rear window of the demonstrator with its integrated optics (optical aperture of 6 mm) [ 1 ]. …”

Section: Figurementioning

confidence: 99%

“…The Artificial Accommodation System (AAS) is a highly integrated system i.e. , an ophthalmic device designed for restoration of the accommodation ability of the human eye [ 1 ]. It is a mechatronic microsystem designed to be implanted into the capsular bag of the human eye [ 2 ] and consists of five functional units.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Robust Design of an Optical Micromachine for an Ophthalmic Application

2016

Self Cite

View full text Add to dashboard Cite

This article describes an approach to the robust design of an optical micromachine consisting of a freeform optics, an amplification linkage, and an actuator. The robust design approach consists of monolithic integration principles to minimize assembly efforts and of an optimization of the functional components with respect to robustness against remaining assembly and manufacturing tolerances. The design approach presented involves the determination of the relevant tolerances arising from the domains manufacturing, assembly, and operation of the micromachine followed by a sensitivity analysis with the objective of identifying the worst offender. Subsequent to the above-described steps, an optimization of the functional design of the freeform optics with respect to a compensation of the effects of the tolerances is performed. The result leads to a robust design of the freeform optics and hence ensures a defined and optimal minimum performance of the micromachine in the presence of tolerances caused by the manufacturing processes and the operation of the micromachine. The micromachine under discussion is the tunable optics of an ophthalmic implant, an artificial accommodation system recently realized as a demonstration model at a scale of 2:1. The artificial accommodation system will be developed to replace the human crystalline lens in the case of a cataract.

show abstract

“… Computer Aided Design (CAD) model of one of both identical lens parts of the AH optics with alignment structures indicated [ 1 ]. …”

Section: Figurementioning

confidence: 99%

Section: Figurementioning

confidence: 99%

“… Precision-molded rear window of the demonstrator with its integrated optics (optical aperture of 6 mm) [ 1 ]. …”

Section: Figurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Robust Design of an Optical Micromachine for an Ophthalmic Application

2016

Self Cite

View full text Add to dashboard Cite

show abstract

“…Alvarez-lenses were studied extensively [12][13][14] and proposed for different technical [15][16][17] as well as ophthalmological applications. [18][19][20][21][22] When using the Alvarez-principle, additional lateral space for lens movement is required in the design. This holds also for conventional lens systems, the refraction power of which can be tuned by mutual shifting of the individual lenses along the optical axis.…”

Section: Introductionmentioning

confidence: 99%

Design studies of varifocal rotation optics

Sieber¹,

Stiller²,

Gengenbach³

2018

Opt. Eng.

Self Cite

View full text Add to dashboard Cite

We present the design of a varifocal freeform optics consisting of two lens bodies each with a helicaltype surface structure of azimuthally varying curvatures. This arrangement allows for tuning the optical refraction power by means of a mutual rotation of the lens bodies around the optical axis. Thus, the refraction power can be tuned continuously in a defined range. The shape of the helical-type surfaces is formed by a change in curvature subject to the azimuthal angle α. At the transition of the azimuthal angle from α ¼ 2π to α ¼ 0, a surface discontinuity appears. Since this discontinuity will seriously affect the imaging quality, it has to be obscured. In the initial state, i.e., zero-degree rotation, the curvatures of the opposing surfaces result in a specific refraction power, which is constant over the entire circular aperture. Rotating one of the lens bodies by an angle φ around the optical axis will change the opposing curvatures and result in a change of refraction power. Two circular sectors with different tunable optical refraction powers are formed, thus resulting in a tunable bifocal optics. Obscuring the minor sector will result in a tunable monofocal rotation optics. In contrast to conventional tunable lens systems, where additional space for axial or lateral lens movement has to be allocated in design, rotation optics allowing for a more compact design. A performance analysis of the rotation optics based on simulations is presented in dependence on aperture size as well as approaches to compensate for spherical aberrations. © The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

show abstract

Optical performance simulation of free-form optics for an eye implant based on a measurement data enhanced model

et al. 2016

View full text Add to dashboard Cite

This paper describes the application of a modeling approach for precise optical performance prediction of free-form optics-based subsystems on a demonstration model of an eye implant. The simulation model is enhanced by surface data measured on the free-form lens parts. The manufacturing of the free-form lens parts is realized by two different manufacturing processes: ultraprecision diamond machining and microinjection molding. Evaluation of both processes is conducted by a simulation of the optical performance on the basis of their surface measurement comparisons with the nominal geometry. The simulation results indicate that improvements from the process optimization of microinjection molding were obtained for the best manufacturing accuracy.

show abstract

Optical design and tolerancing of an ophthalmological system

Cited by 6 publications

References 0 publications

Robust Design of an Optical Micromachine for an Ophthalmic Application

Robust Design of an Optical Micromachine for an Ophthalmic Application

Design studies of varifocal rotation optics

Optical performance simulation of free-form optics for an eye implant based on a measurement data enhanced model

Contact Info

Product

Resources

About