Primary aberrations of a thin lens with different object and image space media

Hazra, Lakshminarayan; Delisle, Claude

doi:10.1364/josaa.15.000945

Cited by 23 publications

(16 citation statements)

References 7 publications

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“…These curvatures are typically represented by the shape factor (SF), which relates the radii of curvature of the anterior (R 1 ) and posterior (R 2 ) surfaces of the lens. 1 In particular, for a lens immersed in symmetrical refractive index media, coma is linearly proportional to the shape factor variable (Hazra & Delisle, 1998). We found that the corneal contribution to the ocular horizontal coma does not vary with age ( Figure 4a).…”

Section: Coupling Of Aberrations With Age and Alignmentmentioning

confidence: 73%

Optical aberrations and alignment of the eye with age

2010

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We explored the relative changes in ocular, corneal, and internal aberrations associated with normal aging with special emphasis in the role of ocular alignment and lens shape factor in the balance of aberrations. Ocular and corneal aberrations together with the angle kappa were measured for a 5-mm pupil diameter in 46 eyes with low refractive errors and ages ranging between 20 and 77 years. The root mean square (RMS) of the higher order ocular and corneal aberrations increased with age at a rate of 0.0032 μm/year and 0.0015 μm/year, respectively. While in young eyes the partial compensation of aberrations by the internal surfaces was clear, no significant difference was found between corneal and ocular RMS in the older group. The ocular spherical aberration (0.0011 μm/year) and horizontal coma (0.0017 μm/year) increased moderately with age. This is not due to changes in the optical alignment, since angle kappa did not vary significantly with age. Age-related variations in the radii of curvature of the crystalline lens modify slightly its shape factor, reducing the compensation of lateral coma. This suggests that geometrical changes in the crystalline lens with age contribute to modify its aberration structure, reducing the compensation mechanism and explaining most of the measured increment of ocular aberrations with age.

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Section: Coupling Of Aberrations With Age and Alignmentmentioning

confidence: 73%

Optical aberrations and alignment of the eye with age

2010

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“…However, these two lenses are immersed in a nonsymmetric refractive index media, from air to aqueous and from aqueous to vitreous, and the mathematical formulation differs from the situation when a symmetrical index space is present. An analytical expression for the Seidel coma of a thin lens immersed in a nonsymmetrical index space is given by [29]…”

Section: A Simple Optical Modeling Of the Compensation Effectmentioning

confidence: 99%

“…where n 1 is the refractive index of the object space, h is the height of the marginal ray at the lens, K is the lens power, ū is the angle between the principal ray and the optical axis of the lens, the p i factors are only functions of the refractive indexes of the media (tabulated in [29]) and X and Y are the shape and position factors defined as follows:…”

Section: A Simple Optical Modeling Of the Compensation Effectmentioning

confidence: 99%

Mechanism of compensation of aberrations in the human eye

et al. 2007

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We studied the mechanism of compensation of aberrations within the young human eye by using experimental data and advanced ray-tracing modeling. Corneal and ocular aberrations along with the alignment properties (angle kappa, lens tilt, and decentration) were measured in eyes with different refractive errors. Predictions from individualized ray-tracing optical models were compared with the actual measurements. Ocular spherical aberration was, in general, smaller than corneal spherical aberration without relation to refractive error. However, horizontal coma compensation was found to be significantly larger for hyperopic eyes where angle kappa tended to also be larger. We propose a simple analytical model of the relationship between the corneal coma compensation effect with the field angle and corneal and crystalline shape factors. The actual shape factors corresponded approximately to the optimum shapes that automatically provide this coma compensation. We showed that the eye behaves as an aplanatic optical system, an optimized design solution rendering stable retinal image quality for different ocular geometries.

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“…Therefore, an explanation unrelated to the alignment properties should be proposed. The Seidel primary aberrations theory for a thin lens predicts a change of coma directly proportional to the square of the optical power of the lens and linearly proportional to its shape factor [35]. These two variables suffer variations of opposite sign during accommodation.…”

Section: A Change Of Aberrations With Accommodationmentioning

confidence: 99%

Modeling the mechanism of compensation of aberrations in the human eye for accommodation and aging

Tabernero

Berrio²,

Artal³

2011

J. Opt. Soc. Am. A

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The mechanisms of compensation of aberration between cornea and lens are somehow modified during both accommodation and aging. In 15 individualized ocular models of young and unaccommodated eyes, we used morphological data of the lens to simulate the effect of accommodation and aging on these mechanisms. The predicted changes in aberrations were compared to data from the literature. In general, only the variation of the lens curvature was enough to reproduce the decrease in ocular spherical aberration (SA) during accommodation. However, the increase in SA with age could only be explained as a consequence of an increase in the conic constant of the lens and/or additional changes on the gradient index.

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Primary aberrations of a thin lens with different object and image space media

Cited by 23 publications

References 7 publications

Optical aberrations and alignment of the eye with age

Optical aberrations and alignment of the eye with age

Mechanism of compensation of aberrations in the human eye

Modeling the mechanism of compensation of aberrations in the human eye for accommodation and aging

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