PMID: 9160029May 1, 1997Paper

Influence of ablation plume dynamics on the formation of central islands in excimer laser photorefractive keratectomy

Ophthalmology
J NoackA Vogel

Abstract

The aim of this study was to understand the dynamics of ablation products during excimer laser photorefractive keratectomy, and their influence on the formation of central islands. Laser flash photography was used to investigate the dynamics of ablation products during photorefractive keratectomy. The ablation plume over polymethyl methacrylate (PMMA) and porcine cornea targets ablated with different zone diameters was imaged at various times between 10 musec and 100 msec after the ablating laser pulse. On PMMA targets, the profiles of the resulting ablation craters were measured. In all cases, the ablation products formed a ring vortex. The plume velocities on cornea were found to be approximately twice as fast as on PMMA for all zone diameters. For both materials, the ablation plume evolves faster for smaller zone diameters. Central islands were observed for zone diameters between 1 and 7 mm on PMMA substrates. The islands became more pronounced with increasing zone diameter. A major cause for the formation of central islands was found to be particle redeposition at the center of the ablation zone. Because of the vortex dynamics, redeposition of particles favorably occurs at the center of the ablation zone. Additionally, the ...Continue Reading

References

Jan 1, 1988·Journal of Cataract and Refractive Surgery·C R MunnerlynJ Marshall
Dec 1, 1983·American Journal of Ophthalmology·S L TrokelB Braren
Jan 1, 1995·Lasers in Surgery and Medicine·D W HahnG H Pettit
Aug 15, 1994·American Journal of Ophthalmology·P J DoughertyR K Maloney
Sep 1, 1994·Ophthalmology·N A SherJ M Frantz
Jan 1, 1993·Journal of Cataract and Refractive Surgery·D T LinM Berman
Jan 1, 1993·Lasers in Surgery and Medicine·G H Pettit, M N Ediger
Nov 1, 1995·Journal of Cataract and Refractive Surgery·M Pop, M Aras

❮ Previous
Next ❯

Citations

Sep 29, 2000·Cornea·R D StultingJ D Carr
Aug 15, 2000·International Ophthalmology Clinics·R J Duffey
Jul 26, 2003·International Ophthalmology Clinics·Elias F Jarade, Dimitri T Azar
Apr 26, 2001·Ophthalmology·U L AbbasUNKNOWN Summit PRK Study Group
Jul 13, 2000·Journal of Cataract and Refractive Surgery·W L ChenH W Chang
Mar 20, 2004·Journal of Cataract and Refractive Surgery·Bert MüllerChristian Hartmann
Jan 11, 2007·Journal of Biomedical Optics·Charles R MunnerlynBenjamin A Logan
Apr 20, 2000·Journal of Cataract and Refractive Surgery·S W KangW J Kim
Dec 16, 1998·Journal of Cataract and Refractive Surgery·T OshikaM B McDonald
Jul 31, 1998·Journal of Cataract and Refractive Surgery·W FörsterR Krueger
Mar 5, 2016·International Ophthalmology Clinics·Brad E KligmanWilliam J Dupps
Aug 19, 2009·Optics Express·Carlos DorronsoroSusana Marcos
Aug 30, 2008·Lasers in Surgery and Medicine·Leia M ShanyfeltDavid W Hahn
Jun 13, 2006·Journal of Cataract and Refractive Surgery·Farhad HafeziTheo Seiler
Aug 21, 2015·Japanese Journal of Ophthalmology·Atsufumi HashimotoHidenaga Kobashi
Mar 4, 2011·Optics Express·Carlos DorronsoroSusana Marcos
Mar 12, 2008·Expert Review of Medical Devices·Miguel J MaldonadoDavid P Piñero
Oct 26, 2018·BMC Ophthalmology·Csaba SzekrényesiZoltán Zsolt Nagy
Feb 13, 2003·Chemical Reviews·Alfred Vogel, Vasan Venugopalan

❮ Previous
Next ❯

Related Concepts

Trending Feeds

COVID-19

Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.

Blastomycosis

Blastomycosis fungal infections spread through inhaling Blastomyces dermatitidis spores. Discover the latest research on blastomycosis fungal infections here.

Nuclear Pore Complex in ALS/FTD

Alterations in nucleocytoplasmic transport, controlled by the nuclear pore complex, may be involved in the pathomechanism underlying multiple neurodegenerative diseases including Amyotrophic Lateral Sclerosis and Frontotemporal Dementia. Here is the latest research on the nuclear pore complex in ALS and FTD.

Applications of Molecular Barcoding

The concept of molecular barcoding is that each original DNA or RNA molecule is attached to a unique sequence barcode. Sequence reads having different barcodes represent different original molecules, while sequence reads having the same barcode are results of PCR duplication from one original molecule. Discover the latest research on molecular barcoding here.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Evolution of Pluripotency

Pluripotency refers to the ability of a cell to develop into three primary germ cell layers of the embryo. This feed focuses on the mechanisms that underlie the evolution of pluripotency. Here is the latest research.

Position Effect Variegation

Position Effect Variagation occurs when a gene is inactivated due to its positioning near heterochromatic regions within a chromosome. Discover the latest research on Position Effect Variagation here.

STING Receptor Agonists

Stimulator of IFN genes (STING) are a group of transmembrane proteins that are involved in the induction of type I interferon that is important in the innate immune response. The stimulation of STING has been an active area of research in the treatment of cancer and infectious diseases. Here is the latest research on STING receptor agonists.

Microbicide

Microbicides are products that can be applied to vaginal or rectal mucosal surfaces with the goal of preventing, or at least significantly reducing, the transmission of sexually transmitted infections. Here is the latest research on microbicides.

© 2021 Meta ULC. All rights reserved