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Biomedical subjects

Dawn Hay

Publications and source records attributed to Dawn Hay.

6 recordsLinked to original sources
PubMed2004

A comparison of digital retinal image quality among photographers with different levels of training using a non-mydriatic fundus camera.

PURPOSE: To evaluate the quality of digital retinal images taken by three photographers with different levels of photographic training, using a non-mydriatic fundus camera. METHODS: This study compares 45-degree digital retinal images taken with a non-mydriatic fundus camera by three different photographers with different levels of photographic training: (I) A professional ophthalmic photographer with 20 years of experience; (2) a non-professional photographer with 2 days of photographic training and experience with 50 patients; (3) a non-professional photographer with 1 hour of photographic training and experience with 10 patients. The quality of the photographs was evaluated by the consensus of two retina specialists. RESULTS: Sixty-four (64) eyes of 33 subjects were imaged by the three photographers for a total of 192 images. Thirty-four eyes were photographed in the non-dilated state. The trained ophthalmic photographer and the two non-professional photographers did not have statistically significant differences in image quality based on the image evaluations. (Chi-square P-value: 0.57). This finding was consistent for eyes in both the non-dilated and dilated state. CONCLUSIONS: Fundus image quality for images taken with a non-mydriatic camera were not significantly different among three photographers with different levels of training.

Diabetic Retinopathy↗
PubMed2004

The current status of diabetes care, diabetic retinopathy screening and eye-care in British Columbia's First Nations Communities.

OBJECTIVES: The objective of this study was to evaluate the current status of primary diabetes care, diabetic retinopathy screening, and eye-care for First Nations individuals with diabetes living on-reserve in British Columbia. STUDY DESIGN: Prospective cross-sectional observational survey. METHODS: A mail-out survey was sent to all BC First Nations Communities in the format of a 26-item questionnaire. A series of general questions were asked concerning community populations, regional transportation options and the availability of local health-care providers. Specific questions about the frequency and source of eye and diabetic retinopathy care in each community were also solicited. RESULTS: A sixty-seven percent questionnaire response rate was achieved (136/202 communities). The community-reported rate of diabetes mellitus ranged from 4.8 to 11.8% with an average of 6.4%. The proportion of on-reserve individuals with diabetes receiving yearly retinal examinations for diabetic retinopathy was found to be only 33%. Many communities received eye-care from more than one professional group, but the majority of basic eye-care and retinopathy screening was provided by optometrists. Ophthalmologists were less likely to provide eye care for these communities; however, family physicians and nurses were frequently responsible for performing eye evaluations. CONCLUSIONS: The vast majority of First Nations people with diabetes who live on-reserve in British Columbia do not have access to annual examinations by an eye-care professional. Eye evaluations and retinal screening were often the responsibility of individuals with little formal training in this area.

British Columbia↗
PubMed2003

Inverted pneumatic retinopexy: a method of treating retinal detachments associated with inferior retinal breaks.

PURPOSE: To introduce the new approach of inverted pneumatic retinopexy for the management of rhegmatogenous retinal detachments with inferior retinal breaks. DESIGN: Retrospective, noncomparative case series. PARTICIPANTS: Eleven patients presenting with rhegmatogenous retinal detachments with causative inferior retinal breaks. INTERVENTION: Sterile gas/air injection, cryopexy/laser retinopexy, with inverted positioning. MAIN OUTCOME MEASURES: Postoperative primary and final anatomical outcome, visual acuity, and complications. RESULTS: Patients were followed for a minimum of 3 months (mean, 5.1 months). Primary retinal reattachment was obtained in 10 of 11(91%) patients. One patient sustained a redetachment secondary to proliferative vitreoretinopathy, resulting in a single operation reattachment rate of 82%. Final reattachment was obtained in 11 of 11 (100%) patients. Mean visual acuity improved about 3 lines from 20/60 to 20/30, with 11 of 11 patients experiencing improvement in their visual acuity. Two patients required an additional surgical procedure to achieve final anatomic success. No new breaks were identified in the postoperative period, and no complications resulted from the pneumatical procedure. CONCLUSIONS: Inverted pneumatic retinopexy can successfully repair retinal detachments with inferior retinal breaks under appropriate conditions.

Adult↗
PubMed2003

Technique for removal of a capsular tension ring from the vitreous.

PURPOSE: To report a new technique for safely and quickly removing a displaced capsular tension ring from the vitreous cavity. DESIGN: Two interventional case reports. PARTICIPANTS: The authors retrospectively reviewed the charts of two patients with displaced capsular tension rings (CTRs). INTERVENTION: Surgical removal of the displaced CTRs was performed in two patients. MAIN OUTCOME MEASURES: Visual and anatomic outcomes. RESULTS: The CTRs were removed surgically, in case 1 by cutting the CTR into two pieces before removal and in case 2 by using the CTR injector to remove the CTR in one piece through a sclerotomy site. Both patients had good visual and anatomic outcomes. CONCLUSIONS: The described technique of removing a displaced CTR in one piece through a sclerotomy site using the CTR injector provides a safe and efficient method of CTR removal. Cutting the CTR into two or more pieces for removal is not recommended.

Aged↗
PubMed2002

Assessment of vision-related function in patients with age-related macular degeneration.

OBJECTIVE: To investigate the validity of the visual function index (VF-14) in assessing visual function in patients with age-related macular degeneration (AMD). DESIGN: Prospective noncomparative observational case series. PARTICIPANTS: One hundred fifty-nine consecutive patients attending a sole practitioner's academic retina-only clinic from May 1998 through August 1998 and from May 1999 through August 1999. MAIN OUTCOME MEASURES: Correlations were calculated between the VF-14 scores and the medical outcomes study 36-item short form (SF-36), weighted comorbidity scale, visual acuity and clinical AMD severity (stage), and vision self-assessment scales. Documentation of the severity of macular degeneration was performed by a sole examiner. RESULTS: There was a moderately strong correlation between visual acuity and trouble with vision (r = 0.51), satisfaction with vision (r = -0.50), and overall quality of vision (r = -0.56). A strong correlation was noted between VF-14 score and patients' self-rating of amount of trouble with vision (r = -0.67), satisfaction with vision (r = 0.62), and overall quality of vision (r = 0.67). In comparison, correlations between SF-36 score and patients' self-rating of amount of trouble with vision, satisfaction with vision, and overall quality of vision ranged from r = 0.37 to r = -0.40. Linear regression analysis for the overall study population indicated that AMD severity was not an independently significant predictor of VF-14 score after adjusting for visual acuity. However, among patients with 20/20 vision in the better eye, AMD severity was an independently significant predictor of VF-14 score after adjusting for visual acuity in the worse eye. CONCLUSIONS: The VF-14 exhibits a considerable degree of validity as a measure of functional impairment in patients with AMD. Age-related macular degeneration severity was an independently significant predictor of VF-14 score in the group of patients with 20/20 vision in the better eye, but this did not hold true for the overall study population. Age-related macular degeneration is associated with substantial impairment in reported visual function.

Aged↗