Intraocular lens short wavelength light filtering

Edwards, Keith; Gibson, George A.

doi:10.1111/j.1444-0938.2010.00538.x

Cited by 17 publications

(17 citation statements)

References 132 publications

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“…The crystalline lens is known to filter out hazardous ultraviolet light in the elderly. However, the clear crystalline lens in young is an inefficient filter of the short wavelength 11. In the present case, the patient had been exposed to high levels of ultraviolet light for a long period of time at a very vulnerable period of life time causing more photic injury to the macula.…”

Section: Discussionmentioning

confidence: 75%

Three-dimensional spectral domain optical coherence tomography in chronic exposure to welding arc

2014

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SUMMARYThree-dimensional spectral domain optical coherence tomography was performed in a 26-year-old man with chronic exposure to welding arc. Advanced macular visualisation provided significant findings of inner segment-ellipsoid zone disruption with the presence of cystoid changes and hyper-reflective material in the area of disruption. The external limiting membrane was intact in both the eyes. C-scan retinal pigment epithelium fit map of the left eye revealed a well-delineated defect whereas the right eye showed a poorly delineated smaller defect. The hyper-reflective material can be hypothesised to originate from the disrupted photoreceptor layer. The hyper-reflective material was more evident in the left eye which could be correlated with more marked diminution of vision and a prominent yellow lesion at the fovea. BACKGROUND

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Section: Discussionmentioning

confidence: 75%

Three-dimensional spectral domain optical coherence tomography in chronic exposure to welding arc

2014

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“…Intraocular lens still permits significant transmission between 350 and 400 nm. Most intraocular lenses provide a reasonable imitation of the spectral characteristics of the natural lens, but probably, the exact balance to the natural lens has not been achieved [23,24].…”

Section: Positive Dysphotopsiamentioning

confidence: 99%

Pseudophakic Dysphotopsia

Aguilar¹

2020

Intraocular Lens

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Pseudophakic dysphotopsia is an unwanted entoptic phenomenon caused by intraocular lenses. Dysphotopsias have been classified as positive (brightness, streaks, haze, or glare) and negative (temporal arc or half-moon crescent) in the visual field. These visual phenomena seem to be well tolerated cause in the case of positive dysphotopsia, but not as well in the negative cases that sometimes discomfort to the patient. The incidence of dysphotopsia ranges from 20% to 77.7%, and the prevalence seems not to be altered by the type of intraocular lens. Pseudophakic dysphotopsia continues to be enigmatic over time; however, many efforts are being made in order to resolve the mystery. In this chapter, the evolution of the dysphotopsia, possible causes, and proposed treatments will be described.

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“…4 However, Rubin et al 48 did detect a slight colour vision anomaly in patients fitted with blue-light filtering IOLs when using a Moreland anomaloscope. 3 However, discovering a colour vision defect with an anomaloscope, which is rarely used in practice when more widely used and clinically accepted tests find no colour defect, gives this finding an academic rather than a clinical importance.…”

Section: Standard Colour Vision Tests Such Farnsworth D15 Andmentioning

confidence: 99%

“…The incidence of ultraviolet (UV) light on the retina gave rise to symptoms of erythropsia, with images having a red-tinged appearance. 3 To reduce erythropsia, from the early 1980s onwards, UV filters were incorporated into the intraocular lens (IOL) material. 4,5 This gave benefits of preventing potentially damaging radiation from reaching the posterior eye and improving image quality without removing longer wavelengths used in vision and other biochemical process.…”

mentioning

confidence: 99%

Blue-light Filtering Intraocular Lenses

Blackmore-Wright¹,

Eperjesi²

2012

European Ophthalmic Review

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Blue-light filtering intraocular lenses are purported to reduce the incidence of potentially damaging UV and blue light on the retina. This article reviews their background, the proposed benefits on long-term eye health and the possible disadvantages on circadian rhythm, scotopic vision and colour vision. KeywordsAge-related macular degeneration, blue-light filtering, circadian rhythm, intraocular lenses, light hazard, retina, ultraviolet The manufacturers of IOLs have now extended the concept of filtering radiation to include short-wavelength blue light (400-500 nm) from the visible spectrum. Blue-light filtering IOLs attenuate wavelengths up to 500 nm. They are readily available to surgeons but at a higher cost compared to standard UV-only blocking lenses. However, there has been controversy as to the extent of any benefit these IOLs provide and there are suggestions that they may have a detrimental effect on vision and the circadian rhythm. Light HazardWith high oxygen levels and constant absorption of radiation in the form of light during waking hours, photo-oxidative reactions occur within the retina and choroid. UV and visible wavelengths up to 600 nm are capable of photochemically damaging the retina, with short-wavelength radiation being more damaging than long-wavelengths. and other posterior pole pathologies.The eye attempts to limit the effects of phototoxicity by shedding photoreceptor outer segments, synthesising antioxidants such as lutein and zeaxanthin within the retina and producing light absorbing pigments such as melanin within the retinal pigment epithelium (RPE) and choroid. 12 The ageing eye is less likely to be able to sustain these protective mechanisms leaving the eye prone to phototoxic damage. 2Lipofuscin is a phototoxic pigment, which naturally accumulates within the retina as the eye ages. It has a peak absorption at 430 nm. 13 Photons absorbed by lipofuscin molecules are raised to an excited state and this results in the production of reactive oxygen species such as singlet oxygen and superoxides as well as free-radicals. Reactive species damage ocular tissue at a cellular level and this reduces the ability of the RPE cells to regulate photoreceptor cell turnover. Eventually the photoreceptors undergo permanent and atrophic damage. 2,7The crystalline lens provides some protection against phototoxicity.In the first three years of life the lens is clear, gradually becoming yellow over time. Pigments comprised of 3-hydroxyl kynurnine are deposited in the lens, particularly in the lens nucleus where UVA (315-400 nm) and UVB (280-315 nm) are absorbed. 2 These pigments, often referred to as chromophores, absorb light wavelengths between 300 and 400 nm preventing UVA, most UVB and some blue-light from reaching the retina.A 53-year-old healthy crystalline lens will allow 75 % of 470 nm blue light to be transmitted, whilst a 70 year old allows only 25 %. 14 Studies haveshown that transmission of blue light through the crystalline lens decreases by 0.7-0.8 % per year because of chromo...

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Intraocular lens short wavelength light filtering

Cited by 17 publications

References 132 publications

Three-dimensional spectral domain optical coherence tomography in chronic exposure to welding arc

Three-dimensional spectral domain optical coherence tomography in chronic exposure to welding arc

Pseudophakic Dysphotopsia

Blue-light Filtering Intraocular Lenses

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