Grounded theory was first introduced more than 50 years ago, but researchers are often still uncertain about how to implement it. This is not surprising, considering that even the two pioneers of t...

https://journals.sagepub.com/doi/pdf/10.1177/16094069211013654

Grounded Theory: A Guide for Exploratory Studies in Management Research:

Purpose: To assess the accuracy of intraocular pressure(IOP) measurements using rebound tonometry over disposable hydrogel (etafilcon A) and silicone hydrogel (senofilcon A) contact lenses (CLs) of different powers.

Methods: The experimental group comprised 36 subjects (19 male, 17 female). IOP measurements were undertaken on the subject’s right eyes in random order using a rebound tonometer (ICare). The CLs had powers of +2.00D, −2.00D and−6.00D. Six measurements were taken over each contact lens and also before and after the CLs had been worn.

Results: A good correlation was found between IOP measurements with and without CLs (all r≥0.80; p < 0.05). Bland Altman plots did not show any significant trend in the difference in IOP readings with and without CLs as a function of IOP value. A two-way ANOVA revealed a significant effect of material and power (p < 0.01) but no interaction. All the comparisons between the measurements without CLs and with hydrogel CLs were significant (p < 0.01). The comparisons with silicone hydrogel CLs were not significant.

Conclusions: Rebound tonometry can be reliably performed over silicone hydrogel CLs. With hydrogel CLs, the measurements were lower than those without CLs. However, despite the fact that these differences were statistically significant, their clinical significance was minimal.

The effect of hydrogel and silicone hydrogel contact lenses on the measurement of intraocular pressure with rebound tonometry

The primary objective of this study was to quantify and characterise lipid deposition on soft (hydrogel) contact lenses, particularly those containing siloxane components. Studies involving a variety of in vitro doping and in vivo worn contact lenses were undertaken, in which lipid deposition was analyzed by either TLC or HPLC. Specific experiments were completed to optimize a method to extract the lipid from the lens materials, to compare the total lipid deposition on nine different hydrogel lenses and to analyze the effect that lipid deposition had on wettability. A method for extracting lipid from contact lenses using 2:1 chloroform: methanol was developed. This study also showed that siloxanecontaining contact lens materials differ in the degree to which they deposit lipid, which is dependent upon their chemical composition. Small differences in lipid deposition that occur due to using variations in cleaning regimens were not identifiable through TLC, and required more sophisticated analysis using HPLC. Contact lens material wettability was found to be influenced by in vitro lipid deposition. Specifically, conventional hydrogels and plasma surface-treated silicone-hydrogel materials experienced enhanced wettability with lipid deposition. Reverse-phase HPLC techniques were able to quantify lipid deposits with increased sensitivity and accuracy. From the HPLC studies it was found that contact lens material, concentration of the lipid doping solution, and the composition of the lipid doping solution in in vitro deposition studies influenced the ultimate amount and composition of lipid deposits. In vivo HPLC studies showed that the final lipid deposition pattern was influenced by the interaction between the composition of the tear film and the various silicone hydrogel contact lens materials. In conclusion,

/pdf/lipid-deposition-on-hydrogel-contact-lenses-2judtw62kw.pdf

Lipid Deposition on Hydrogel Contact Lenses

http://repositorium.sdum.uminho.pt/bitstream/1822/31213/1/Abstract.pdf

Intraocular pressure measurement with ocular response analyzer over soft contact lens.

Dynamic contour tonometry over silicone hydrogel contact lens.

Goldmann applanation tonometry over daily disposable contact lens: accuracy and safety of procedure.

Contact lens development and type Contact lens uses, advantages and disadvantages Rigid contact lens materials: varieties, features and uses Rigid contact lens types, designs, fitting methods Rigid contact lens evaluation of fit and follow up Rigid contact lens handling and care of lenses Case records Soft contact lens materials features and uses Soft contact lens types, manufacture checking Soft contact lens selection Soft contact lens fitting and prescription aspects Soft contact lens handling and care After care and problems Case records Disposables Scleral lenses, types and manufacture Impression lenses, methods and applications Preformed sclerals Optic fitting and prescription Handling, care and checking Follow-up of scleral lens patients Contact lens practice in the UK and elsewhere Modifications to contact lenses Contact lenses in presbyopia Appendices: Questions Basic tables Summary of terms

Contact Lens Practice: A Clinical Guide

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Goldmann applanation tonometry over daily disposable contact lens: accuracy and safety of procedure.

Contact Lens Practice: A Clinical Guide