scholarly journals Quantitative Compressive Optical Coherence Elastography Using Structural OCT Imaging and Optical Palpation to Measure Soft Contact Lens Mechanical Properties

2021 ◽  
Author(s):  
Zachery Quince ◽  
David Alonso-Caneiro ◽  
Scott Read ◽  
Michael Collins
Keyword(s):  
Mechanical Properties ◽  
Contact Lens ◽  
Optical Coherence ◽  
Soft Contact ◽  
Soft Contact Lens ◽  
Oct Imaging

Mechanical properties of the soft contact lens of poly(methyl methacrylate-N-vinylpyrrolidone)

1980 ◽  
Vol 14 (5) ◽  
pp. 557-566 ◽  
Author(s):  
S. Hosaka ◽  
A. Yamada ◽  
H. Tanzawa ◽  
T. Momose ◽  
H. Magatani ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Methyl Methacrylate ◽  
Contact Lens ◽  
Soft Contact ◽  
Poly Methyl Methacrylate ◽  
Soft Contact Lens

scholarly journals Characterization of Soft Contact Lens Fitting Using Ultra-Long Scan Depth Optical Coherence Tomography

2017 ◽  
Vol 2017 ◽  
pp. 1-13 ◽  
Author(s):  
Lele Cui ◽  
Ming Li ◽  
Meixiao Shen ◽  
Fan Lu ◽  
Jianhua Wang
Keyword(s):  
Optical Coherence Tomography ◽  
Contact Lens ◽  
Contact Lenses ◽  
Repeated Measurements ◽  
Optical Coherence ◽  
Soft Contact ◽  
Soft Contact Lenses ◽  
Soft Contact Lens ◽  
Good Repeatability ◽  
The Right

Objectives. To evaluate the centration and movement of soft contact lenses and to verify the repeatability of two repeated measurements of the lens centration and movement using ultra-long scan depth optical coherence tomography (UL-OCT). Methods. A 1-day Acuvue® Define™ lens was tested on both eyes of 10 subjects (5 males and 5 females; mean age, 31.6 years). The centration and blink-induced movement of the contact lens were measured using UL-OCT at 5 min and 30 min after insertion. The measurements were repeated once at each checkpoint. Results. Good repeatability was found in the lens centration and movement between the two repeated measurements at either checkpoint. The values of the lens movement were 0.457 ± 0.248 mm and 0.402 ± 0.229 mm at 5 min and decreased to 0.197 ± 0.065 mm and 0.211 ± 0.110 mm at 30 min after insertion for the right and left eyes, respectively (P<0.05). Conclusions. The custom-built UL-OCT presented good repeatability of centration and movement in Define lenses at 5 min and 30 min after insertion. Most of the lenses were centered temporal and inferior to the cornea during the first 30 min wearing period. Compared with 5 min after insertion, the lens was centered better and exhibited less movement at 30 min.

scholarly journals Fixation Stability and Deviation in Optical Coherence Tomography Angiography Using Soft Contact Lens Correction in Myopes

2021 ◽  
Author(s):  
Andrew Kwok-cheung Lam ◽  
Kenny Kin-hei Lau ◽  
Ho-yin Wong ◽  
Jasmine Pui-kwan Lam ◽  
Man-for Yeung
Keyword(s):  
Optical Coherence Tomography ◽  
Contact Lens ◽  
Optical Coherence Tomography Angiography ◽  
Contact Lenses ◽  
Foveal Avascular Zone ◽  
Optical Coherence ◽  
Soft Contact ◽  
Soft Contact Lens ◽  
Fixation Stability ◽  
Auto Focus

Abstract ObjectiveTo compare fixation deviation and stability with soft contact lens correction and device built-in auto-focus system during optical coherence tomography angiography (OCTA).MethodsThis observational study measured OCTA metrics first with contact lens correction, followed by removal of contact lenses, using the device auto-focus system at a University Optometry Clinic, Hong Kong. All participants were habitual soft contact lens wearers with either low or high myopia. OCTA measurements were obtained using a spectral domain OCTA. Fixation deviation was distance (in pixels) of the fovea to the center of the OCTA measurement grid. Fixation stability was test-retest repeatability (TRR) and coefficient of variation (CV) of fixation deviation from three consecutive OCTA measurements. OCTA metrics included vessel length density (VD), perfusion density (PD), and foveal avascular zone (FAZ) area. Averaged OCTA metrics were calculated from three measurements and compared between the two correction methods.ResultsThe mean ± SD spherical equivalent of 74 eyes from 74 myopes measured was -1.94D ± 0.75D in low myopes (n=37) and -7.97D ± 1.31D in high myopes (n=37). When corrected with contact lenses, visual acuities of high myopes (median [IQR], -0.06 [0.08] logMAR) and low myopes (0.02 ± 0.08 logMAR) were similar (P = 0.060), and with similar fixation deviation (5.0 ± 2.2 pixels vs 5.3 [3.6] pixels; P = 0.689). High myopes had poorer fixation stability than low myopes (TRR: 10.2 pixels vs 7.5 pixels; CV: 65% vs 54%, respectively). The worst fixation stability occurred when high myopes were corrected using the auto-focus system (TRR: 12.5 pixels, CV: 72%). The difference in VD and PD was within 1mm-1 and 1%, respectively. The FAZ area was similar.Conclusions High myopes had more stable fixation when corrected when wearing contact lenses. Subjects with good contact lens corrected visual acuity should wear their contact lenses during OCTA measurements.

Sign in / Sign up

Export Citation Format

Share Document