Limitations of Scheimpflug photography in quantifying glistenings

Mackool, Richard J.; Colin, Joseph

doi:10.1016/j.jcrs.2009.03.044

Cited by 15 publications

(8 citation statements)

References 4 publications

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“…However, in the study by Klos et al 18 using Scheimpflug photography, the glistenings found in all 41 AcrySof IOLs at 1 year were described as ''occurring in every part of the IOL.' ' Mackool and Colin 21 believe there was some confusion between light scattering from glistenings and surface light scattering in the study by Behndig and Mö nestam. 20 They highlight the possible limitations of the use of Scheimpflug photography in quantifying glistenings in a recently published letter to the editor.…”

Section: Grading Location and Sizementioning

confidence: 99%

“…20 They highlight the possible limitations of the use of Scheimpflug photography in quantifying glistenings in a recently published letter to the editor. 21 According to them, there is no demonstration of the ability of this technique to distinguish between light scattering due to glistenings and light scattering due to other variables, such as aqueous-IOL interface, posterior capsule opacification (PCO), or biological materials deposited on the IOL surface. Indeed, in the study by Behndig and Mö nestam, 20 the reported correlation coefficients for the given light scattering amounts (interpreted as glistenings) and postoperative time were higher for Scheimpflug photography than for subjective grading of glistenings done under a slitlamp in the same patients.…”

Section: Grading Location and Sizementioning

confidence: 99%

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Glistenings and surface light scattering in intraocular lenses

Werner¹

2010

Journal of Cataract and Refractive Surgery

173

161

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Section: Grading Location and Sizementioning

confidence: 99%

Section: Grading Location and Sizementioning

confidence: 99%

Glistenings and surface light scattering in intraocular lenses

Werner¹

2010

Journal of Cataract and Refractive Surgery

173

161

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“…Recently, there has been confusion and controversy surrounding the term glistening, and this was discussed in a recent review article (Werner 2010). The use of the Scheimpflug technique was criticized in a letter to the editor by authors who believe that this technique is potentially limited in its ability to quantify glistenings (Mackool & Colin 2009). Those investigators believe that surface light scattering could result from causes other than glistenings, such as a biomaterial or other deposits on the IOL surface.…”

Section: Discussionmentioning

confidence: 99%

Comparison of glistenings in intraocular lenses with three different materials: 12‐year follow‐up

Rønbeck

Behndig

Taube

et al. 2011

Acta Ophthalmologica

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ABSTRACT.Purpose: To compare the degree of lens glistenings associated with three intraocular lenses (IOLs) of different materials and examine the relationship between the dioptric power of the optics and lens glistenings in a long-term study. Setting: St. Erik Eye Hospital, Stockholm, Sweden. Methods: Forty-six eyes of 46 patients underwent standard phacoemulsification and implantation with a heparin-surface-modified (HSM) polymethylmethacrylate (PMMA) IOL, a silicone IOL or a hydrophobic acrylic IOL. Evaluations of the patients and the glistenings were conducted 11.3-13.4 years postoperatively. The glistenings were examined using Scheimpflug imaging and subsequently analysed using an image analysis program. Results: The median follow-up time was 12.2 years (range, 11.3-13.4). The hydrophobic acrylic IOL had significantly more lens glistenings than the silicone (p = 0.003) and the PMMA (p = 0.000) IOLs. The silicone IOL had significantly more lens glistenings than the PMMA lens (p = 0.048). The IOL power did not affect the degree of lens glistenings in the hydrophobic acrylic IOL group (p = 0.64). The other groups had too little lens glistenings to evaluate the relationship. Conclusion: In this long-term follow-up study, the hydrophobic acrylic IOL had a significantly higher degree of lens glistenings compared to the silicone and PMMA IOLs. The PMMA IOL had almost no lens glistenings. The IOL dioptric power was not significantly correlated with the degree of lens glistenings associated with the hydrophobic acrylic IOL.

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“…2 Glistenings are fluid-filled microvacuoles that form inside the intraocular lens optic when the IOL is in an aqueous environment, thereby producing an internal light scattering which is difficult to distinguish from surface light scattering. [2][3][4] Werner et al, 5 when analyzing some one-piece hydrophobic acrylic IOLs removed from cadaver eyes, demonstrated that surface light scattering significantly increased when compared with scattering in IOLs that had not been used, but their transmittance did not vary. Although the controversy continues, it seems that the cause of light scattering on the surface of hydrophobic acrylic IOLs (referred to by some authors as whitening) is due to a trace of water molecules that infiltrate the optic.…”

Section: Introductionmentioning

confidence: 99%

Determination of scattering in intraocular lenses by spectrophotometric measurements

et al. 2014

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Abstract. This study presents a method for measuring scattering in explanted intraocular lenses (IOLs). Currently, determining scattering in IOLs is usually performed by Scheimpflug cameras and the results are expressed in the units used by this apparatus. The method we propose uses a spectrophotometer and this makes it possible to measure the total transmission of the IOL by using an integrating sphere; the direct transmission is determined by the double-beam mode. The difference between these two transmissions gives a value of the scattering in percentage values of light lost. In addition, by obtaining the spectral transmission curve, information about the most scattered wavelengths is also obtained. The IOL power introduces errors when directly measured, particularly with high powers. This problem can be overcome if a tailor-made cuvette is used that shortens the distance between the IOL and the condensing lens of the spectrophotometer when the IOL powers are below 24 diopters. We checked the effectiveness of this method by measuring the scattering of three explanted IOLs from cornea donors. This method, however, does not make it possible to ascertain whether the scattering measured is caused by surface light scattering or internal light scattering. © 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.

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Limitations of Scheimpflug photography in quantifying glistenings

Cited by 15 publications

References 4 publications

Glistenings and surface light scattering in intraocular lenses

Glistenings and surface light scattering in intraocular lenses

Comparison of glistenings in intraocular lenses with three different materials: 12‐year follow‐up

Determination of scattering in intraocular lenses by spectrophotometric measurements

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