Picking colours? RICK RACK does our best to accurately represent all products and colours but colours may appear different between device screens. Picking colours? RICK RACK does our best to accurately represent all products and colours but colours may appear different between device screens. Please be aware that any cut fabric cannot be returned or exchanged, so if you're not sure about colour drop us a line or send us an email! All patterns and printed materials (books, magazines, etc.) are final sale. Review the pattern closely before purchase and check your own measurements against the pattern specifications. Buying patterns? Pattern size ranges can vary depending on the pattern, designer, and style. Add a bit of length to factor in shrinkage during prewashing. Check the unit of measure (we go by meters). Want to put in a request for a 0.5 meter cut? Find the form HERE!īuying fabric? Measure twice so that we can cut once! Review your pattern. Its a Shopify thing and as soon as we find an awesome workaround you can count on us to make that magic happen. Trans Am Ophthalmol Soc 111: 34–45.SOLD IN FULL METERS - fabric, elastic, and other products that are cut to measure are available only in full meters for online orders. (2013) Optical coherence tomography-based corneal power measurement and intraocular lens power calculation following laser vision correction (an American Ophthalmological Society thesis). The Ks, Kf and Km obtained by Topcon KR-1W and iTrace showed excellent intraobserver repeatability and interobserver and intersession reproducibility in normal eyes. Huang D, Tang M, Wang L, Zhang X, Armour RL, Gattey DM, et al. Clin Experiment Ophthalmol 34: 640–644.ĭe Bernardo M, Capasso L, Rosa N (2014) Algorithm for the estimation of the corneal power in eyes with previous myopic laser refractive surgery. Curr Eye Res 32: 421–429.Ĭhan CC, Hodge C, Lawless M (2006) Calculation of intraocular lens power after corneal refractive surgery. Langenbucher A, Scholz K, Szentmary N, Seitz B (2007) Calculations of corneal power after corneo-refractive surgery from keratometry and change of spectacle refraction: some considerations on the "clinical history method". Liu Y, Wang Y, Wang Z, Zuo T (2012) Effects of error in radius of curvature on the corneal power measurement before and after laser refractive surgery for myopia. Given that the intraobserver repeatability and interobserver and intersession reproducibility of corneal astigmatism measurements obtained by Topcon KR-1W and iTrace were poor, it should be cautious that Topcon KR-1W and iTrace were applied for the preparation of toric lens implantation. The agreement between Topcon KR-1W and Topolyzer, Topcon KR-1W and IOLMaster, iTrace and Topolyzer, iTrace and IOLMaster, Topcon KR-1W and iTrace were not so good, they should not be interchangeable in clinical application. The Ks, Kf and Km obtained by Topcon KR-1W and iTrace showed excellent intraobserver repeatability and interobserver and intersession reproducibility in normal eyes. The 95% LoA were approximately 1.0 D to 1.5 D for all measurements. The mean differences between Topcon KR-1W, iTrace, and the other 2 devices were small. Statistically significant differences existed between Topcon KR-1W and IOLMaster, Topcon KR-1W and iTrace, Topcon KR-1W and Topolyzer, iTrace and Topolyzer, iTrace and IOLMaster for Ks, Kf and Km measurements (all P < 0.05). However, J0 and J45 showed poor intraobserver repeatability and interobserver and intersession reproducibility (all ICCs not greater than 0.446). Intraobserver repeatability and interobserver and intersession reproducibility of the Ks, Kf and Km showed a CoV of no more than 0.5%, a 2.77Sw of 0.70 D or less, and an ICC of no less than 0.99. Agreements between devices were assessed using Bland-Altman analysis and 95% limits of agreement (LoA). Repeatability and reproducibility of measurements were evaluated by the within-subject standard deviation (Sw), coefficient of variation (CoV), test-retest repeatability (2.77Sw), and intraclass correlation coefficient (ICC). The steep keratometry (Ks), flat keratometry (Kf), mean keratometry (Km), J0 and J45 were analyzed. About one week later, the first observer repeated the measurements using the Topcon KR-1W and iTrace. Another observer performed additional 3 consecutive scans using the Topcon KR-1W and iTrace in the same session. The right eyes of 100 normal subjects were prospectively scanned 3 times using all the 4 devices. To evaluate the repeatability and reproducibility of corneal power measurements obtained by Topcon KR-1W and iTrace, and assess the agreement with measurements obtained by Allegro Topolyzer and IOLMaster.
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