Central Corneal Thickness and Corneal Hysteresis During Corneal Swelling Induced by Contact Lens Wear With Eye Closure

2007 ◽  
Vol 143 (4) ◽  
pp. 616-622.e2 ◽  
Author(s):  
Fan Lu ◽  
Suzhong Xu ◽  
Jia Qu ◽  
Meixiao Shen ◽  
Xiaoxing Wang ◽  
...  
Keyword(s):  
Contact Lens ◽  
Central Corneal Thickness ◽  
Corneal Thickness ◽  
Corneal Hysteresis ◽  
Contact Lens Wear ◽  
Eye Closure ◽  
Lens Wear

scholarly journals A review of African studies on central corneal thickness

2016 ◽  
Vol 75 (1) ◽  
Author(s):  
Nishanee Rampersad ◽  
Rekha Hansraj
Keyword(s):  
Contact Lens ◽  
Refractive Surgery ◽  
Central Corneal Thickness ◽  
Corneal Thickness ◽  
African Studies ◽  
Global Studies ◽  
Contact Lens Wear ◽  
Diagnosis Classification ◽  
Lens Wear

Recently, there has been increasing interest in understanding central corneal thickness (CCT) measurements in various populations. This may be related to the influence of CCT in the diagnosis, classification and management of glaucoma. In addition, CCT measurements are also important for monitoring corneal diseases and contact lens wear, indicating the overall health of the cornea and assessing eligibility for refractive surgery. This article reviews studies that have reported CCT measurements in non-glaucomatous African sub-populations. The CCT measurements, gender associations and limitations of these studies are highlighted. The findings of these studies and their implications are discussed in relation to global studies reporting on CCT measurements.

scholarly journals The Effects of Soft Contact Lens Wear on Corneal Thickness, Curvature, and Surface Regularity

2014 ◽  
Vol 4 (2) ◽  
pp. 35-39
Author(s):  
RP Sah ◽  
N Paudel ◽  
M Chaudhary ◽  
P Adhikari ◽  
SK Mishra
Keyword(s):  
Contact Lens ◽  
Central Corneal Thickness ◽  
Corneal Thickness ◽  
Corneal Topography ◽  
Control Group ◽  
Soft Contact ◽  
Contact Lens Wear ◽  
Soft Contact Lens ◽  
The Mean ◽  
Lens Wear

Contact lenses have various cosmetic and optical advantages over spectacles. However, long term lens use might affect the normal corneal anatomy and physiology in a variety of ways. The aim of this study was to determine the effect of soft contact lens wear on corneal thickness, curvature, and surface regularity.A total of 138 eyes of 69 subjects wearing contact lenses for more than 1 year were evaluated. One eye of each case was randomly selected for the analysis. Nidek Magellan Mapper corneal topography system was used to evaluate the anterior corneal topography. Central corneal thickness (CCT) was measured using Quantel Medical Axis II PR. Corneal topography and CCT measurements on 138 eyes of 69 subjects were performed. The mean age of the cases and controls was 24.76 ± 5.52 25.13±5.49 years respectively. The mean dura­tion of contact lens wear was 4.83±4.19 years. The mean CCT in case and control group was 527.56±37.40 microns and 544.60±26.10 microns respectively. The mean central corneal thickness in the cases was significantly less by about 16.31 μm in comparison to controls (P <0.05, 95% CI of the difference: 9 μm - 24μm). The SRI and SAI indices were significantly greater in contact lens wearers than in the control group (P = 0.00 for both SRI and SAI).Regular corneal pachymetry and topography assessments are mandatory in soft contact lens users as long term lens wear appears to reduce the central corneal thickness and increase the corneal surface irregularity. DOI: http://dx.doi.org/10.3126/jcmc.v4i2.10861 Journal of Chitwan Medical College 2014; 4(2): 35-39

Effects of extended continuous silicon hydrogel contact lens wear on central corneal thickness and ocular surface

2018 ◽  
Vol 41 ◽  
pp. S36
Author(s):  
Murat Direl ◽  
Tuncay Küsbeci ◽  
Bora Yüksel ◽  
Gökhan Kerci ◽  
Duygu Uzunel ◽  
...  
Keyword(s):  
Contact Lens ◽  
Ocular Surface ◽  
Central Corneal Thickness ◽  
Corneal Thickness ◽  
Contact Lens Wear ◽  
Lens Wear ◽  
Silicon Hydrogel

scholarly journals Impact of Rigid Gas Permeable Contact Lenses Removal on Anterior and Posterior Corneal Surfaces in Keratoconus Patients

2019 ◽  
Author(s):  
Motohiro Itoi ◽  
Koji Kitazawa ◽  
Hisayo Higashihara ◽  
Chie Sotozono
Keyword(s):  
Contact Lens ◽  
Contact Lenses ◽  
Corneal Thickness ◽  
Anterior Segment ◽  
Corneal Surface ◽  
Contact Lens Wear ◽  
Surface Areas ◽  
The Impact ◽  
Lens Wear ◽  
Anterior Posterior

AbstractPurposeTo evaluate the impact of removal of rigid gas-permeable (RGP) contact lenses on the anterior and posterior cornea surfaces of eyes with keratoconus.MethodsEight eyes of 8 patients with keratoconus (KC) (age 34.3 ± 15.3 years; range 19–60 years) were enrolled. Anterior segment optical coherence tomography (AS-OCT) was performed at 1, 5, 10, 20, and 60 minutes after the patients removed their RGP contact lenses. Measurements included anterior and posterior best-fit sphere (BFS); elevation values and corneal surface areas; corneal thickness at the thinnest point; and the anterior-posterior ratio of the corneal surface (As/Ps) between 1 minute and 60 minutes after RGP contact lens removal.ResultsAnterior and posterior elevation values and corneal surface areas showed significant increases, whereas anterior and posterior BFS and central corneal thickness decreased significantly (P < 0.01) between 1 minute and 60 minutes after RGP contact lens removal. No statistically significant differences were found in the As/Ps ratio during the first hour after suspending RGP contact lens wear.ConclusionsWe found that the patients with keratoconus experienced significant changes in both the anterior and posterior corneal shape for 60 minutes after removal of RGP contact lenses.

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