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Hakan Demirci

Other affiliations: Military Medical Academy, Henry Ford Health System, Yahoo!  ...read more
Bio: Hakan Demirci is an academic researcher from University of Michigan. The author has contributed to research in topics: Medicine & Visual acuity. The author has an hindex of 44, co-authored 322 publications receiving 7485 citations. Previous affiliations of Hakan Demirci include Military Medical Academy & Henry Ford Health System.


Papers
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TL;DR: Despite the fact that the clinical features of sebaceous carcinoma have been widely reported, the diagnosis was suspected initially in only 32% of patients at first examination elsewhere and in only 50% at histopathologic examination elsewhere.

351 citations

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TL;DR: Carefully selected treatment can anatomically stabilize or improve the eye with Coats disease in 76% of eyes, however, poor visual outcome of 20/200 or worse commonly results, and patients with stages 4 and 5 have a poor visual prognosis.

319 citations

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TL;DR: The spectrum and frequency of melanocytic and nonmelanocytic conjunctival tumors in an ocular oncology practice was reported, with malignant epithelial, lipomatous, leukemic, and secondary tumors presented at a mean age of >60.

312 citations

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TL;DR: Sebaceous carcinoma of the ocular region is a malignant neoplasm that is being recognized more frequently and managed by innovative techniques of local resection, cryotherapy, topical chemotherapy, and radiotherapy, resulting in improved visual and systemic prognosis.

300 citations

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TL;DR: Coats disease is a distinct clinical entity characterized by idiopathic retinal telangiectasia and retinal exudation that is usually unilateral, occurs mostly in young males, and can cause severe visual loss resulting from exudative retinal detachment.

285 citations


Cited by
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Journal Article
TL;DR: In this paper, the authors measured the macular choroid thickness in normal eyes at different points using enhanced depth imaging (EDI) optical coherence tomography (OCT) and evaluated the association of choroidal thickness and age.
Abstract: PURPOSE To measure macular choroidal thickness in normal eyes at different points using enhanced depth imaging (EDI) optical coherence tomography (OCT) and to evaluate the association of choroidal thickness and age. DESIGN Retrospective, observational case series. METHODS EDI OCT images were obtained in patients without significant retinal or choroidal pathologic features. The images were obtained by positioning a spectral-domain OCT device close enough to the eye to acquire an inverted image. Seven sections were obtained within a 5 x 30-degree area centered at the fovea, with 100 scans averaged for each section. The choroid was measured from the outer border of the retinal pigment epithelium to the inner scleral border at 500-microm intervals of a horizontal section from 3 mm temporal to the fovea to 3 mm nasal to the fovea. Statistical analysis was performed to evaluate variations of choroidal thickness at each location and to correlate choroidal thickness and patient age. RESULTS The mean age of the 30 patients (54 eyes) was 50.4 years (range, 19 to 85 years), and 14 patients (46.7%) were female. The choroid was thickest underneath the fovea (mean, 287 microm; standard deviation, +/- 76 microm). Choroidal thickness decreased rapidly in the nasal direction and averaged 145 microm (+/- 57 microm) at 3 mm nasal to the fovea. Increasing age was correlated significantly with decreasing choroidal thickness at all points measured. Regression analysis suggested that the subfoveal choroidal thickness decreased by 15.6 microm for each decade of life. CONCLUSIONS Choroidal thickness seems to vary topographically within the posterior pole. The thickness of the choroid showed a negative correlation with age. The decrease in the thickness of the choroid may play a role in the pathophysiologic features of various age-related ocular conditions.

1,008 citations

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TL;DR: Although the hypotheses regarding the mechanisms underlying the development and maintenance of specific Internet-use disorders, summarized in the I-PACE model, must be further tested empirically, implications for treatment interventions are suggested.

854 citations

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TL;DR: In this paper, a retrospective chart review was carried out for 1264 consecutive patients referred for a suspected orbital mass over a 30-year period to determine the incidence of specific orbital tumors based on patients referred to an ocular oncology center.

818 citations

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TL;DR: It is accepted that MGD is important, conceivably underestimated, and possibly the most frequent cause of dry eye disease due to increased evaporation of the aqueous tears, and a comprehensive review of physiological and pathophysiological aspects of the meibomian glands is sought.
Abstract: The tarsal glands of Meibom (glandulae tarsales) are large sebaceous glands located in the eyelids and, unlike those of the skin, are unassociated with hairs. According to Duke-Elder and Wyler,1 they were first mentioned by Galenus in 200 AD and later, in 1666, they were described in more detail by the German physician and anatomist Heinrich Meibom, after whom they are named. Lipids produced by the meibomian glands are the main component of the superficial lipid layer of the tear film that protects it against evaporation of the aqueous phase and is believed also to stabilize the tear film by lowering surface tension.2 Hence, meibomian lipids are essential for the maintenance of ocular surface health and integrity. Although they share certain principal characteristics with ordinary sebaceous glands, they have several distinct differences in anatomy, location, secretory regulation, composition of their secretory product, and function. Functional disorders of the meibomian glands, referred to today as meibomian gland dysfunction (MGD),3 are increasingly recognized as a discrete disease entity.4–8 In patients with dry eye disease, alterations in the lipid phase that point to MGD are reportedly more frequent than isolated alterations in the aqueous phase. In a study by Heiligenhaus et al.,9 a lipid deficiency occurred in 76.7% of dry eye patients compared with only 11.1% of those with isolated alterations of the aqueous phase. This result is in line with the observations by Shimazaki et al.10 of a prevalence of MGD in the absolute majority of eyes with ocular discomfort defined as dry eye symptoms. These observations noted that 64.6% of all such eyes and 74.5% of those excluding a deficiency of aqueous tear secretion were found to have obstructive MGD, or a loss of glandular tissue, or both.10 Horwath-Winter et al.11 reported MGD in 78% of dry eye patients or, if only non-Sjogren patients are considered, in 87% compared with 13% with isolated aqueous tear deficiency. It may thus be accepted that MGD is important, conceivably underestimated, and possibly the most frequent cause of dry eye disease due to increased evaporation of the aqueous tears.5,9–12 After some excellent reviews of MGD4,7,8,13,14 in the past, many new findings have been reported in recent years, and other questions remain to be identified and resolved. A sound understanding of meibomian gland structure and function and its role in the functional anatomy of the ocular surface15 is needed, to understand the contribution of the meibomian glands to dysfunction and disease. Herein, we seek to provide a comprehensive review of physiological and pathophysiological aspects of the meibomian glands.

799 citations

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TL;DR: The aim of this review is to recapitulate the clinical understanding of CSCR, with an emphasis on the most recent findings on epidemiology, risk factors, clinical and imaging diagnosis, and treatments options, and the novel mineralocorticoid pathway hypothesis.

690 citations