scholarly journals Phakic Intraocular Lenses in Keratoconus

2015 ◽  
Vol 4 (3) ◽  
pp. 103-106
Author(s):  
Jorge L Alio ◽  
Pablo Sanz-Díez
Keyword(s):  
Refractive Surgery ◽  
Optical Quality ◽  
Intraocular Lenses ◽  
Tissue Ablation ◽  
Corneal Tissue ◽  
Effective Operation ◽  
Phakic Intraocular Lenses ◽  
Myopic Astigmatism ◽  
Corneal Thinning

ABSTRACT Purpose To discuss and summarize the indications, contraindications and results in refractive surgery for keratoconus. Summary Keratoconus is an ectatic corneal disease characterized by a progressive corneal thinning and irregular astigmatism that negatively impact in the visual function and the optical quality of the patients. The refractive surgery in keratoconus has been discussed by several authors. The two primary lines of action are phakic lens implantation and corneal tissue ablation using photorefractive keratectomy. The use of phakic intraocular lenses (IOLs) to correct myopia and compound myopic astigmatism associated with keratoconus is gaining popularity. Recent findings The use of phakic IOLs to correct myopia and compound myopic astigmatism associated with keratoconus is gaining popularity. According to a recent study by our group the safety of this procedure in visual terms is high (post-CDVA/ pre-CDVA = 1.19 ± 0.29). It is also an effective operation (post-UDVA/pre-CDVA = 0.90 ± 0.26). How to cite this article Alio JL, Sanz-Díez P. Phakic Intraocular Lenses in Keratoconus. Int J Kerat Ect Cor Dis 2015;4(3):103-106.

scholarly journals Optical quality of hyperopic and myopic phakic intraocular lenses

2014 ◽  
Vol 62 (4) ◽  
pp. 437 ◽  
Author(s):  
Cari Pérez-Vives ◽  
Alberto Domínguez-Vicent ◽  
Teresa Ferrer-Blasco ◽  
David Madrid-Costa ◽  
Robert Montés-Micó
Keyword(s):  
Optical Quality ◽  
Intraocular Lenses ◽  
Phakic Intraocular Lenses

Intraocular Optical Quality of Phakic Intraocular Lenses: Comparison of Angle-Supported, Iris-Fixated, and Posterior Chamber Lenses

2013 ◽  
Vol 156 (4) ◽  
pp. 789-799 ◽  
Author(s):  
Jorge L. Alio ◽  
Pablo Peña-García ◽  
Ketevan Pachkoria ◽  
Jorge L. Alio ◽  
Amr El Aswad
Keyword(s):  
Optical Quality ◽  
Intraocular Lenses ◽  
Posterior Chamber ◽  
Phakic Intraocular Lenses ◽  
Posterior Chamber Lenses

In vitro optical quality of monofocal aspheric toric intraocular lenses: effect of cylindrical power

2017 ◽  
Vol 38 (3) ◽  
pp. 933-941
Author(s):  
Teresa Ferrer-Blasco ◽  
Alberto Domínguez-Vicent ◽  
Santiago García-Lázaro ◽  
María Amparo Diez ◽  
José F. Alfonso ◽  
...  
Keyword(s):  
Optical Quality ◽  
Intraocular Lenses

Analysis of the Optical Quality of Spherical and Aspheric Intraocular Lenses in Simulated Nanophthalmic Eyes

2016 ◽  
Vol 32 (3) ◽  
pp. 193-200 ◽  
Author(s):  
Bruno Lovaglio Cançado Trindade ◽  
Felipe Tayer Amaral ◽  
Davies William de Lima Monteiro
Keyword(s):  
Optical Quality ◽  
Intraocular Lenses

scholarly journals Visual acuity and image quality in 5 diffractive intraocular lenses

2017 ◽  
Vol 28 (1) ◽  
pp. 36-41 ◽  
Author(s):  
Genís Cardona ◽  
Fidel Vega ◽  
Miguel A. Gil ◽  
Consuelo Varón ◽  
José A. Buil ◽  
...  
Keyword(s):  
Visual Acuity ◽  
Image Quality ◽  
Optical Quality ◽  
Intraocular Lenses ◽  
Modulation Transfer ◽  
Multifocal Intraocular Lenses ◽  
Corrected Distance Visual Acuity ◽  
Good For

Purpose: To compare objective image quality at distant, intermediate, and near foci with the corresponding visual acuity (VA) in patients symmetrically implanted with 5 different diffractive multifocal intraocular lenses (IOLs) (ReSTOR SV25T0, Tecnis ZKB00, Tecnis ZLB00, AT LISA 809, and AT LISA Tri 839MP) and a monofocal lens (Tecnis ZA9003) 3 months after cataract intervention. Methods: Objective image quality, measured as the area under the modulation transfer function curve (AMTF), was tested in vitro in an eye model. In addition, corrected distance visual acuity and distance-corrected intermediate and near visual acuities (DCIVA and DCNVA) were assessed in a group of 79 patients, randomly implanted with one of the lenses. Results: Image quality and VA at the distant focus was good for all lens designs, but was similarly compromised at the intermediate focus, where the best DCIVA corresponded to the low add ZKB00. At the near focus, the monofocal lens and the distance dominant SV25T0 had the worst AMTF values, with the ZLB00 presenting the best DCNVA. The relationship between AMTF and VA was found not to be linear, with VA being similarly good for AMTF values over a certain threshold. Conclusions: Visual acuity of pseudophakic patients reflected the optical quality of the specific IOL design within a certain range of measurements, beyond which maximum VA is limited by other ocular, optical, and neuropsychophysical factors.

Advanced Intraocular Lens Designs

2010 ◽  
Vol 04 (01) ◽  
pp. 82 ◽  
Author(s):  
Phillip J Buckhurst ◽  
Shehzad A Naroo ◽  
Sunil Shah ◽  
◽  
◽  
...  
Keyword(s):  
New Technology ◽  
Optical Quality ◽  
Intraocular Lenses ◽  
Age Related Macular Degeneration ◽  
Rotational Stability ◽  
Focal Points ◽  
Non Invasive ◽  
Age Related ◽  
Toric Iols

Intraocular lenses (IOLs) have evolved since their introduction and spherical monofocal designs are no longer the only pseudophakic option. IOLs with a toric surface are able to correct astigmatism, but are dependent on the accuracy of placement. Haptic design is very important with toric IOLs as different designs demonstrate different post-operative rotational stability. Multifocal IOLs produce multiple focal points within the eye and so provide the capacity for simultaneous distance and near vision. Various mechanisms for creating these focal points exist, which determine how light is distributed. Accommodating IOLs use the optic shift principle in order to restore the accommodative response. Single and dual optic variations exist; however, the restoration of accommodation has been limited and variable with the current generation of these IOLs. Aspherical IOLs are designed to improve the optical quality of the image created by the IOL. Aspherical correcting IOLs are dependent on their centration and tilt. New phacoemulsification technology allows cataract removal through a sub-2mm incision, and microincisional IOLs can be implanted through these incisions, which results in minimal surgical impact on the cornea. Blue- and violet-blocking IOLs have been introduced, which might help prevent the development of age-related macular degeneration. Light-adjustable lenses are a relatively new technology and allow non-invasive post-operative adjustment of the IOL’s refractive power. This is a fast-moving area of research and development due to the high demands of clinical practice.

Posterior chamber toric phakic intraocular lenses for myopic astigmatism: First experience in India

2012 ◽  
Vol 38 (9) ◽  
pp. 1583-1589 ◽  
Author(s):  
Rohini Pothireddy ◽  
Kasu Prasad Reddy ◽  
Sirisha Senthil ◽  
Harsha L. Rao
Keyword(s):  
Intraocular Lenses ◽  
Posterior Chamber ◽  
Phakic Intraocular Lenses ◽  
Myopic Astigmatism
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