Konstruktion eines Modellauges zur Simulation von Purkinje-Spiegelbildern für die Bestimmung der Krümmungsradien und der Lage der Augenlinse - Construction of a Model Eye to Simulate Purkinje Reflections for the Determination of the Radii of Curvature and of the Position of the Crystalline Lens of the Eye

Kirschkamp, T.; Jöckel, Michael; Wählisch, G; Barry, Jean-Cyriaque

doi:10.1515/bmte.1998.43.11.318

Cited by 4 publications

(1 citation statement)

References 5 publications

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“…Another reference to Purkinje image measurements using eye models is described in Barry et al [ 12 ], where six physical eye models were built for ophtalmo-phakometric measurements of ocular radius and curvature. The eye models were based on Le Grand’s schematic eye [ 94 ], with varying combinations of corneal and crystalline lens parameters, and the design was previously described In [ 95 ]. Briefly, each model included a cornea and a crystalline lens, mounted on a brass body of four segments that formed an enclosure which was filled with distilled water.…”

Section: Measurement Modalities Of Eye Modelsmentioning

confidence: 99%

Opto-Mechanical Eye Models, a Review on Human Vision Applications and Perspectives for Use in Industry

Amorim

Bret²,

González-Meijóme

2022

Sensors

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The purpose of this review is to aggregate technical information on existent optomechanical eye models (OME) described in the literature, for image quality assessment in different applications. Several physical eye models have been reviewed from peer-reviewed papers and patent applications. A typical eye model includes an artificial cornea, an intraocular lens or other lens to simulate the crystalline lens, an aperture as the pupil, and a posterior retinal surface, which may be connected to a light sensor. The interior of the eye model may be filled with a fluid to better emulate physiological conditions. The main focus of this review is the materials and physical characteristics used and the dimensional aspects of the main components including lenses, apertures, chambers, imaging sensors and filling medium. Various devices are described with their applications and technical details, which are systematically tabulated highlighting their main characteristics and applications. The models presented are detailed and discussed individually, and the features of different models are compared when applicable, highlighting strengths and limitations. In the end there is a brief discussion about the potential use of artificial eye models for industrial applications.

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Section: Measurement Modalities Of Eye Modelsmentioning

confidence: 99%

Opto-Mechanical Eye Models, a Review on Human Vision Applications and Perspectives for Use in Industry

Amorim

Bret²,

González-Meijóme

2022

Sensors

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Operator-induced errors in Hartmann-Shack wavefront sensing: Model eye study

Cerviño

Hosking

Dunne

2007

Journal of Cataract and Refractive Surgery

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Accuracy of cornea and lens biometry using anterior segment optical coherence tomography

2007

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We assess the accuracy of the Visante anterior segment optical coherence tomographer (AS-OCT) and present improved formulas for measurement of surface curvature and axial separation. Measurements are made in physical model eyes. Accuracy is compared for measurements of corneal thickness (d(1)) and anterior chamber depth (d(2)) using-built-in AS-OCT software versus the improved scheme. The improved scheme enables measurements of lens thickness (d(3)) and surface curvature, in the form of conic sections specified by vertex radii and conic constants. These parameters are converted to surface coordinates for error analysis. The built-in AS-OCT software typically overestimates [mean+/-standard deviation(SD)]d(1) by +62+/-4 mum and d(2) by + 4 +/- 88 microm. The improved scheme reduces d(1) (-0.4 +/- 4 microm) and d(2) (0 +/- 49 microm) errors while also reducing d(3) errors from +218 +/- 90 (uncorrected) to +14 +/- 123 microm (corrected). Surface x coordinate errors gradually increase toward the periphery. Considering the central 6-mm zone of each surface, the x coordinate errors for anterior and posterior corneal surfaces reached +3 +/- 10 and 0 +/- 23 microm, respectively, with the improved scheme. Those of the anterior and posterior lens surfaces reached +2 +/- 22 and +11 +/- 71 microm, respectively. Our improved scheme reduced AS-OCT errors and could, therefore, enhance pre- and postoperative assessments of keratorefractive or cataract surgery, including measurement of accommodating intraocular lenses.

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Abstract: The properties of the specular reflections of the model eye are very close to the target values in human eyes. One of the advantages of the model eye is the compact design. This model eye is the first measuring standard for phakometry.

Cited by 4 publications

References 5 publications

Opto-Mechanical Eye Models, a Review on Human Vision Applications and Perspectives for Use in Industry

Opto-Mechanical Eye Models, a Review on Human Vision Applications and Perspectives for Use in Industry

Operator-induced errors in Hartmann-Shack wavefront sensing: Model eye study

Accuracy of cornea and lens biometry using anterior segment optical coherence tomography

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