Tilt and Decentration of Intraocular Lenses-a Brief Review

Sauer, Thomas

doi:10.15406/aovs.2015.02.00051

“…Although, the asymmetry parameters of the refractive surface are defined relative to the optical axis, the assumed values of the tilt given by angle β and the calculated decentration e are of the order of the corresponding values reported in [20,21]. Moreover, the calculated range in (15) agrees with the observed values of the abathic distance in human vision [23,24], its average value being…”

Section: The Abathic Distancesupporting

confidence: 72%

“…I should mention that different axes and angles have been used in measurements of the eye's misaligned optical components [20,21], which are later compared with those used in the asymmetric eye. However, the angle α has the least amount of inter-patient variability and is the most reliable benchmark for refractive surgery [22].…”

Section: B the Asymmetric Eyementioning

confidence: 99%

Binocular System with Asymmetric Eyes

Turski

¹

2017

Preprint

0

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I elaborate binocular geometry with a novel eye model that incorporates the fovea's temporalward displacement and the cornea and the lens' misalignment. The formulated binocular correspondence results in longitudinal horopters that are conic sections resembling empirical horopters. When the eye model's asymmetry parameters' range is that which is observed in healthy eyes, abathic distance also falls within its experimentally observed range. This range in abathic distance is similar to that of the vergence resting position distance. Further, the conic's orientation is specified by the eyes' version angle, integrating binocular geometry with eye movement. This integration presents the possibility for modeling 3D perceptual stability during physiological eye movements.

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“…The law of parsimony suggests that the best functional models will include only those details of the eye absolutely necessary for accomplishing the model's purpose [18]. Following this law, the eye model constructed here incorporates the most important features of the human eye's asymmetric design: the fovea's displacement on the retina from the posterior pole and the cornea and crystalline lens' misalignment [20,21]. This asymmetric eye, which minimally extends the reduced eye in Figure 4 (a), is schematically shown in Figure 4 (b) for the right eye.…”

Section: B the Asymmetric Eyementioning

confidence: 99%

“…In the asymmetric eye, I assume the average value α = 5.2 • . I should mention that different axes and angles have been used in measurements of the eye's misaligned optical components [20,21], which are later compared with those used in the asymmetric eye. However, the angle α has the least amount of inter-patient variability and is the most reliable benchmark for refractive surgery [22].…”

Section: B the Asymmetric Eyementioning

confidence: 99%

“…The lens' tilt and decentration in human eyes are measured in different ways as the result of using different techniques. In [20], the tilt and decentration values were obtained relative to the corneal axis while, in [21], the tilt was obtained relative to the fixation axis and the decentration was obtained relative to the pupil center.…”

Section: The Abathic Distancementioning

confidence: 99%

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Binocular system with asymmetric eyes

Turski¹

2018

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I elaborate binocular geometry with a novel eye model that incorporates the fovea's temporalward displacement and the cornea and the lens' misalignment. The formulated binocular correspondence results in longitudinal horopters that are conic sections resembling empirical horopters. When the eye model's asymmetry parameters' range is that which is observed in healthy eyes, abathic distance also falls within its experimentally observed range. This range in abathic distance is similar to that of the vergence resting position distance. Further, the conic's orientation is specified by the eyes' version angle, integrating binocular geometry with eye movement. This integration presents the possibility for modeling 3D perceptual stability during physiological eye movements.

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Intraoperative trypan blue central landmark and its use in capsulotomy and capsulorhexis centration

Stodulka,

Packard,

Mordaunt

2024

J Cataract Refract Surg

0

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Purpose: To compare 3 capsulotomy centration methods. Setting: Private clinic, Zlin, Czech Republic. Design: Prospective, consecutive case series. Methods: 180 eyes undergoing cataract surgery had anterior capsule staining with microfiltered 0.4% trypan blue solution before selective laser capsulotomy. The first 60 eyes (Group 1) had mydriatic dilated pupil centered capsulotomies. The next 60 eyes (Group 2) were centered on the trypan blue central landmark (TCL). The final 60 capsulotomies (Group 3) were centered on the patient fixated coaxial Purkinje reflex (CPR). Measurements between key anatomical landmarks and the TCL, CPR capsulotomies, and implanted intraocular lens (IOL) center were made. Results: The TCL, observed in >94% of eyes in the study, coincided with the CPR with a displacement of <0.1 ± 0.1 mm. Group 1 capsulotomies were noticeably decentered on the IOLs by 0.3 ± 0.2 mm. The Group 2 symmetrical IOL relationship was maintained with a decentration of 0.15 ± 0.1 mm. Group 3 had a similar decentration with the IOLs with 0.15 ± 0.1 mm. Verification with IOLMaster 700 data and CALLISTO Eye System showed that the CPR and the TCL were coincident with the measured visual axis. Conclusions: The clearly visible TCL served as an alternate landmark to the patient fixated CPR, and being on the anterior capsule was not sensitive to tilt. Further patient compliance was not required. Both were superior to dilated pupil centration, to achieve symmetric IOL coverage. This has application for both capsulotomies and capsulorhexes.

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Tilt and Decentration of Intraocular Lenses-a Brief Review

Cited by 4 publications

References 37 publications

Binocular System with Asymmetric Eyes

Binocular System with Asymmetric Eyes

Binocular system with asymmetric eyes

Intraoperative trypan blue central landmark and its use in capsulotomy and capsulorhexis centration

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