Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 67 for “"contact lens"”.
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Embedded Power Active Contact Lens
<p>This thesis designed and fabricated an active contact lens that notifies the user during the detection of an external wireless signal. The lens contained a printed antenna to communicate with a 2.4GHz system and provide inductive charging operating at 13.56 MHz. The lens utilizes a CBC005 5µAh …
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Biochemical markers and contact lens wear
… develop a reliable selection procedure to match contact lens materials with individual wearers by the identification of a biochemical marker for assessment of in-eye performance of contact lenses. There is a need for such a procedure as one of the main reasons for contact lens wearers ceasing …
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Ocular biotribology and contact lens lubrication mechanisms
… in this thesis is concerned with mechanisms of contact lens lubrication. There are three major driving forces in contact lens design and development; cost, convenience, and comfort. Lubrication, as reflected in the coefficient of friction, is becoming recognised as one of the major factors …
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The tear film and contact lens wear
Contact lenses have become a popular method of vision correction for millions of people globally. As with all devices designed for use within the body, interactions occur between the implanted material and the surrounding biological fluid. A common complaint of lens wearers is that they often …
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Tear film structure of the contact lens wearer
… film on the cornea and on different types of contact lenses. The techniques are as follows: 1. A high magnification technique of photography using the biamtcroscope and crossed polartsed light, allows the measurement of tear film layer thicknesses and on the surface of rigid contact lenses and …
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A mobile application promoting good contact lens practices
Contact lens complications pose an ongoing problem for both optometrists and contact lens wearers. Most of these complications are due to noncompliance to good care practices. Education is the first step to ensuring compliance. If good habits are created on commencement of wear, patients are more …
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Advanced Engineering of Contact Lens Coatings using Electrohydrodynamic Atomization
… (EHDA) to engineer novel coatings for ocular contact lenses. EDHA was selected to develop coatings for the delivery of timolol maleate (TM); with the intention of achieving sustained drug release for treatment of glaucoma. The work presented here is a proof-of-concept; showing the versatility …
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The eyelid and its role in contact lens discomfort
… exfoliation (MBE) on eyelid characteristics in contact lens discomfort were investigated. Upper lid-wiper epitheliopathy, lid parallel conjunctival folds, secretions quality, expressibility, foam at orifices and acini secretion reflectivity of meibomian glands, tear lipid layer thickness and …
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Wettability and hydrophilicity of rigid and soft contact lens surfaces
In the last two decades an abundance of contact lens materials with unknown surface properties have been introduced as well as new contact lens design. Recent studies have identified the importance of physical and chemical interactions between materials and liquids. The purpose of this experimental …
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Analytical techniques for the study of soft contact lens spoilation
Soft contact lens wear has become a common phenomenon in recent times. The contact lens when placed in the eye rapidly undergoes change. A film of biological material builds up on and in the lens matrix. The long term wear characteristics of the lens ultimately depend on this process. With time …
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Evaluating modeling techniques for quantifying production risk in contact lens manufacturing
… Vision (JJV) is a leading manufacturer of contact lenses offering a variety of vision correction products. They have a strong commitment to innovation--defining new product categories and improving existing ones--to better patient outcomes, but this poses a challenge for machine production …
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Factors associated with soft contact lens replacement noncompliance of wearers in Windhoek
… and twenty five million people worldwide wear contact lenses (Barr, 2006). The contact lens market is increasing at an alarming rate globally and Namibia is no exception, but there are no known national statistics. Soft contact lens wearers do not comply to their specific lens replacement …
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Design and Fabrication Techniques of Devices for Embedded Power Active Contact Lens
… that were interfaced to an IC for an active contact lens that notifies the user of an event by detection of an external wireless signal. The contact lens consisted of an embedded antenna providing communication with a 2.4GHz system, as well as inductive charging at an operating frequency of …
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improving contact lens manufacturing through cost modeling and batch production scheduling optimization
J&J Vision Care (JJVC) uses production scheduling methods that are not fully optimized, causing over-production of certain SKUs, and reducing capacity for other SKUs on backorder. This makes planning a weekly run-schedule for each line difficult. It is also difficult to understand where to invest …
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Building strategy to penetrate deeper into the stagnant and unattractive contact lens market
… to penetrate deeper into the stagnant and mature contact lens market by focusing on adolescents. First, contact lens adoption is studied to strategically generate awareness and build community effect for increasing purchase. Second, the competition is analyzed broadly at an industry level to …
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Laser induced fluorescence measurement of the tear film thickness under a contact lens
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1997.
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The friction coefficient of soft contact lens surfaces in relation to comfort and performance
The soft contact lenses of today are made from a variety of hydrogel materials. These materials have different properties in terms of water content, monomers, hardness and other tensile characteristics. It is likely that the frictional properties also vary between materials. It is known that …
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Development of a non-destructive fluorescence technique for analysis of contact lens deposition levels
… a method for analysis of surface deposition on contact lenses. In order to achieve this it was first necessary to ascertain whether fluorescence analysis would be able to detect and distinguish between protein and lipid deposited on a lens surface. In conjunction with this it was important to …
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