Laser induced photochemical surface modification of PMMA for fibrin free intraocular lens
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The central part of a PMMA or acrylic resin lens was modified into hydrophobic and the peripheral part to be phydrophilic using teh ArF laser and excimer lamp. PMMA or acrylic resin lens have been used as an intraocular lens for 50 years and is the golden standard in ophthalmology. However, protein and fat are stuck onto the IOL surface after long-term implantation and opacify the surface )after-cataract). Therefore, the central part of the IOL was modified to be hydrophobic to prevent fat and protein deposition; the periphery was made hydrophilic to develop affinity for tissue.Keywords:
Intraocular lenses
Polymethyl methacrylate
Surface Modification
About 35% of intraocular lenses now implanted in the United States are narrow profile lenses, measuring on the average 5.0 mm by 6.0 mm. This study sought to determine whether these lenses cause unwanted optical images with a decrease in the quality of vision. Seventy-five eyes with a 5.0 mm × 6.0 mm intraocular lens (IOL) were compared with 75 eyes with a 6.5 mm IOL. All patients had capsulorhexis, phacoemulsification, and capsular fixation of the IOL. There was no statistically significant difference in unwanted visual images (16% and 20%, respectively), ability to drive at night (79% and 69%), or patient satisfaction. Careful patient selection is, however, important.
Intraocular lenses
Capsulorhexis
Multifocal intraocular lens
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Intraocular lenses
Interim
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This review provides an update of recent advances in understanding the quality and functional significance of contrast sensitivity for the clinician regarding cataract, intraocular lenses and refractive surgery that goes beyond the measurement of visual acuity.New American National Standards Institute standards for contrast sensitivity based on linear sine-wave gratings are discussed that promise rapid advances of understanding and quantifying visual quality and function by unifying clinical results reported using contrast sensitivity. Increased sensitivity of linear sine-wave gratings over proposed bull's-eye radial gratings is discussed. Digital-image-processing software uses contrast sensitivity data to process images to help understand the quality of what the patient sees. Contrast sensitivity measurement is compared with wavefront aberrometry. Contrast sensitivity measures the total visual system quality in terms of contrast, whereas wavefront aberrometry measures the optical quality in terms of spatial distortion. Both measurements are needed to more fully understand the quality of vision.Recent advances provide the clinician with an awareness of why the new contrast-sensitivity standards are based on linear sine-wave gratings and how image-processing software can be used to better understand the quality of functional vision of the patient.
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The review of domestic and foreign literature sources examining different methods of fixation of posterior chamber intraocular lenses after phacoemulsification of cataract, complicated capsular support of the lens is presented. There is a sufficiently widespread of transscleral suturing of the IOL and the prospect of developing IOL fixation in corneal layers.
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As cataract surgery transforms into refractive surgery, functional intraocular lens (IOL) emerged and gradually satisfied expectations of most cataract patients, which have become parts of cataract surgery significantly. So far, functional intraocular lens are still not perfect, whose limitation should draw the attention of ophthalmologists. In our review, we take Toric IOL, asphric IOL and IOL for correction of presbyobia for examples to elaborate the limitations of the functional IOL respectively.
Key words:
Lenses,intraocular; Limitation; Cataract
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In this paper we compare 4 groups of intraocular lenses: PMMA, silicone, hydrogel, acrylic and their influence on posterior capsule opacification is discussed. The possible clinical consequences of different shape in optic part of intraocular lens is also described. This article contains also a short presentation of posterior capsule opacification mechanism and intraocular lens materials biocompatibility in in-vivo and in-vitro experiments.
Posterior Capsule Opacification
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Lens capsule
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I would like to comment on the report by Busin et al1in the March 1993 issue of theArchives. The authors have shown the advantages of a scleral tunnel incision in inducing very little astigmatism even when no sutures are used. They failed to point out (along with many other authors) that the scleral tunnel incision, which was first described in 1982,2,3was later4shown to induce a mean of only 0.34 diopters (D) of astigmatism even when closed with absorbable sutures. The incision was approximately 8 mm long, and a 7-mm posterior chamber intraocular lens was used. The sclerocorneal tunnel incision has been used in millions of cataract extractions via phacoemulsification. My question is this: should the incision be sutured closed or left unsutured? Reports have shown that the unsutured incision can be opened during trauma.5Other reports have shown that when the incision
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Intraocular lenses
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Presentation (obstetrics)
Cataract extraction
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