Effect of anatomical differences and intraocular lens design on negative dysphotopsia

Vught, Luc van; Que, Ivo; Luyten, Gregorius P M; Beenakker, Jan-Willem M.

doi:10.1097/j.jcrs.0000000000001054

Cited by 5 publications

(15 citation statements)

References 32 publications

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“…11 All simulations were performed in OpticStudio (v. 20.3.2, Zemax, LCC) through the ZOSPy package (v. 0.6.1). 6,20 A wavelength of 543 nm and corresponding refractive indices were used. 11 Two different IOL designs were used for the pseudophakic eye model.…”

Section: Methodsmentioning

confidence: 99%

“…For each ray, the location where it illuminated the retina was determined, which was expressed as the angle with respect to the center of the retina (Figure 1). 6 The relation between the visual field angle and the illuminated retinal location in the phakic eye model was used as a reference to determine whether exchanging the crystalline lens for an IOL would induce a shift in the visual field. To that end, the illuminated retinal locations of the pseudophakic eye were mapped onto the illuminated retinal locations of the phakic eye.…”

Section: Methodsmentioning

confidence: 99%

“…2,9,10 Furthermore, different geometrical eye models have been developed to reproduce the optical characteristics of the general population while others have incorporated distinct anatomical features of eyes with specific conditions, such as ND. 6,7,9,11 In ray-tracing simulations related to peripheral vision, however, one also needs to consider which segment of the retinal surface is used to see a specific part of the visual field. For this purpose, Simpson et al determined the relation between the position of a light source, relative to the optical axis of their eye model, and the part of the retina which was illuminated.…”

mentioning

confidence: 99%

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Peripheral visual field shifts after intraocular lens implantation

van Vught,

Luyten,

Beenakker

2023

J Cataract Refract Surg

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Purpose: To assess whether intraocular lens (IOL) implantation induces shifts in the peripheral visual field. Setting: Department of Ophthalmology, Leiden University Medical Center, Leiden, the Netherlands. Design: Ray tracing study. Methods: Non-sequential ray tracing simulations were performed with phakic and pseudophakic versions of the same eye model to assess potential shifts in the visual field after IOL implantation. Two different IOL designs were evaluated and for each design 5 different axial positions and 7 different intrinsic powers were tested. The relation between the physical position of the light source and the location where the retina was illuminated was determined for each eye model. Subsequently, these relations were used to calculate whether the visual field shifts in pseudophakic eyes. Results: The pseudophakic visual field shift was below 1 degree for central vision in all evaluated models. For peripheral vision, the light rays in the pseudophakic eyes were refracted to a more central retinal location compared to phakic eyes, resulting in a central shift of the peripheral visual field. The magnitude of the shift depended on the IOL design and its axial position, but could be as high as 5.4 degrees towards central vision. Conclusion: IOL implantation tends to have little effect on the central visual field but can induce an over 5 degrees shift in the peripheral visual field. Such a shift can affect the perception of peripheral visual complaints.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

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Peripheral visual field shifts after intraocular lens implantation

van Vught,

Luyten,

Beenakker

2023

J Cataract Refract Surg

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“…In 2020, van Vught et al performed quantitative measurements, similar to those of Fernández et al, in a cohort of ND patients and showed that they have larger deviations from a textbook eye model than controls [4]. Later studies subsequently confirmed that these anatomical differences have a direct relation with the shadow perceived by these subjects [2]. The study of Fernández provides a similar first set of clues for PD by showing that the amount of light distortion is related to the temporal centration of the IOL.…”

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confidence: 92%

“…Although ray tracing studies have unveiled the most likely optical origins of these conditions [1,2], the understanding of why specific patients perceive these complaints and others do not is still a topic of continuing research and debate. The study by Fernández et al [3] highlights two important elements, which are essential to understand the visual performance on the single subject.…”

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confidence: 99%

More on light dysphotopsia origin in pseudophakia

Grzybowski

Beenakker

2023

Graefes Arch Clin Exp Ophthalmol

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Peripheral defocus of monofocal intraocular lenses

Natarajan,

Maceo Heilman,

et al. 2024

J Cataract Refract Surg

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Purpose: To quantify the angular-dependence of monofocal intraocular lens (IOL) power. Setting: Ophthalmic Biophysics Laboratory, Kallam Anji Reddy campus, L V Prasad Eye Institute, Hyderabad, India. Design: Laboratory study. Methods: Experiments were performed on IOLs from two different manufacturers (APPALENS 207, Appasamy Associates and SN60WF, Alcon Laboratories). IOL powers ranged from 17 to 25 D. The IOLs were mounted in a fluid-filled chamber and the on-axis and off-axis powers were measured using a laser ray tracing system over the central 3 mm zone with delivery angles ranging from -30° to +30° in 5° increments. The position of the best focus was calculated for each IOL at each angle. The angular dependence of IOL power was compared with theoretical predictions. Results: Peripheral defocus increased significantly with increasing incidence angle and power. The peripheral defocus at ±30° increased from 5.8 D to 8.5 D when the power increased from 17.5 D to 24.5 D for APPALENS 207 and from 4.9 D to 7.4 D when the power increased from 17 D to 25 D for SN60WF. The mean difference between the measured and theoretical tangential power at ±30° was 0.50 ± 0.16 D for the APPALENS 207 and -0.40 ± 0.10 D for the SN60WF, independent of IOL power. Conclusions: IOLs introduce a significant amount of peripheral defocus which varies significantly with IOL power and design. Given that peripheral defocus is related to lens power, replacement of the natural lens (approximately 24 D) with an IOL will produce a significant difference in peripheral defocus profile after surgery.

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Effect of anatomical differences and intraocular lens design on negative dysphotopsia

Abstract: Ray-tracing simulations show that anatomical differences between patients with and without negative dysphotopsia have a strong, up to 18%, effect on the severity of the complaint.

Cited by 5 publications

References 32 publications

Peripheral visual field shifts after intraocular lens implantation

Peripheral visual field shifts after intraocular lens implantation

More on light dysphotopsia origin in pseudophakia

Peripheral defocus of monofocal intraocular lenses

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