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The purpose of this study is to demonstrate that omega-3 supplement can be use as an adjunct therapy for PRK patients. The investigators believe that omega-3 supplement will reduce the size of persistent epithelial defects (PEDS) and eventually hasten the corneal reepithelialization after PRK surgery. If the outcome of this study proves to be effective, then PRK would be a more attractive option to those seeking refractive treatment.
Dry eye and persistent epithelial defects (PEDS) following LASIK and PRK are one of the most common conditions encountered by refractive surgeons and their patient's today.¹⁻⁴ They are associated with significant clinical morbidity in patients resulting in minor problems such as discomfort, to extreme debilitation such as visual loss. There is no accepted definition of persistent epithelial defect (PED) that includes a time period of recovery. We favor the definition given in one text "… when the epithelium fails to re-grow over a defect within the expected time course.⁵ The causes of PED are diverse, with several definite etiologies' including dry eyes, limbal stem cell deficiency, diabetes mellitus and neurotrophic problems. A variety of treatment modalities have been described for PED. The elimination of predisposing associated risk remains a key factor in the management process. Therefore, to prevent and manage this common disorder it is important to have an understanding of the pathophysiology of dry eye after LASIK and PRK. This includes and understanding of the relationship and interaction between inflammation, sensory denervation and essential fatty acid pathways. Reports of clinical efficacy of anti-inflammatory therapies for treatment of dry eye disease provide direct proof of the principle that inflammation is involved in the etiology of dry eye disease. Research has shown that the omega-3 polyunsaturated fatty acids are some of the most effective natural anti inflammatory agents available. The active ingredients in omega 3, EPA ( Eicosapentanoic acid ) which is a 20 carbon omega 3-fatty acid with 5 double-bonds , and DHA ( docosahexanoic acid )which is 22 carbon omega-3 fatty acid with 6 double bond, both found in certain fish oils enhance the conversion of COX ( cyclooxygenase) to prostaglandin E3. A natural anti inflammatory agent, prostaglandin E3 competitively inhibits the effects of the arachidonic acid conversion to prostaglandin E2, a highly inflammatory substance. Prostaglandin E3 also inhibits the synthesis of TNFα and IL-1β, both of which are inflammatory leukotrienes, also by competitive inhibition.⁶ʹ⁷ By decreasing inflammation and stimulating aqueous tear production in rabbits cAMP has been shown to stimulate aqueous tear secretion in dry eye. Furthermore, by decreasing inflammation and augmenting oil and water layers of the tear film, omega-3 supplementation with fish oil rich in EPA may improve both the lipid and aqueous component of the tear film. This may improve surgical outcomes by stabilizing the tear film, reducing epithelial defects and promoting wound healing
Allocation: Randomized, Endpoint Classification: Pharmacokinetics Study, Intervention Model: Parallel Assignment, Masking: Single Blind (Subject), Primary Purpose: Supportive Care
Omega-3 Fatty Acid Supplements
UCSD Shiley Eye Center
University of California, San Diego
Published on BioPortfolio: 2014-07-24T14:10:09-0400
This study will test the effectiveness of two different kinds of omega-3 fatty acid dietary supplements in treating the symptoms of major depression.
Omega-3 fatty acids are "good fats," and are among the most important nutrients lacking in Western diets today. The average person in developing countries consumes less than 100 mg of DHA ...
This protocol will determine the pK profile of two different omega-3 fatty acid supplements on plasma EPA and DHA levels.
This study is being done to detect the metabolic changes that Omega 3 fatty acid treatment has on the brain and to find out whether magnetic resonance spectroscopy (MRS) scan can detect me...
This study investigates the therapeutic efficacy and safety of omega-3 fatty acids rich in eicosapentaenoic acid / docosahexaenoic acid in pediatric depression in a nine months double-blin...
There is emerging evidence that Omega-3 polyunsaturated fatty acids (PUFA) supplements can decrease aggression. However, experimental studies with adults from non-specific populations are scarce. We h...
Since fatty acid composition of uterus phospholipids is likely to influence embryo implantation, this study was conducted to investigate the effects of dietary omega-3 and -6 fatty acids on implantati...
Animal models support dietary omega-3 fatty acids protection against abdominal aortic aneurysm (AAA), but clinical data are scarce. The sum of red blood cell proportions of the omega-3 eicosapentaenoi...
Families with children who have neurodevelopmental disorders and mental health problems often opt to use nonmainstream and complementary medicines including dietary supplements. One dietary supplement...
FATTY ACIDS which have the first unsaturated bond in the sixth position from the omega carbon. A typical American diet tends to contain substantially more omega-6 than OMEGA-3 FATTY ACIDS.
A group of fatty acids, often of marine origin, which have the first unsaturated bond in the third position from the omega carbon. These fatty acids are believed to reduce serum triglycerides, prevent insulin resistance, improve lipid profile, prolong bleeding times, reduce platelet counts, and decrease platelet adhesiveness.
An omega-6 fatty acid produced in the body as the delta 6-desaturase metabolite of linoleic acid. It is converted to dihomo-gamma-linolenic acid, a biosynthetic precursor of monoenoic prostaglandins such as PGE1. (From Merck Index, 11th ed)
An unsaturated fatty acid that is the most widely distributed and abundant fatty acid in nature. It is used commercially in the preparation of oleates and lotions, and as a pharmaceutical solvent. (Stedman, 26th ed)
A doubly unsaturated fatty acid, occurring widely in plant glycosides. It is an essential fatty acid in mammalian nutrition and is used in the biosynthesis of prostaglandins and cell membranes. (From Stedman, 26th ed)
Ophthalmology is the branch of medicine that is devoted to the study and treatment of eye diseases. As well as mild visual defects correctable by lenses, ophthalmology is concerned with glaucoma, uveitis and other serious conditions affecting the eye, ...