Publications by authors named "Murat Oklar"

4 Publications

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Evaluating the quality, utility, and reliability of the information in uveitis videos shared on YouTube.

Int Ophthalmol 2022 Aug 9. Epub 2022 Aug 9.

Department of Ophthalmology, Kartal Dr Lütfi City Hospital, University of Health Sciences, Semsi Denizer Street, E-5, 34890, KartalIstanbul, Turkey.

Background: This study aimed to analyze the quality of videos on YouTube as educational resources about uveitis.

Methods: An online YouTube search was performed using the keyword "uveitis". Total view counts, duration of videos, publishing dates, likes and dislikes, numbers of comments, and source of videos were recorded. The quality and accuracy of the video's educational content were evaluated using the DISCERN score, Global Quality Score (GQS), and Journal of the American Medical Association (JAMA) score. Video power index (VPI) was used to evaluate both the view and the like ratio of the videos. All videos were classified according to publishers and types of categories.

Results: From among the 200 videos analyzed, 94 were included. The mean DISCERN score was 38.5 ± 13.2 (poor), the mean JAMA score was 1.8 ± 0.6 (fair), and the GQS was 2.5 ± 0.9 (fair). There were positive correlations between the three checklists (p < .001). VPI was not correlated with each score (p > .05). The most common upload sources were ophthalmologists (24.4%) and YouTube channels about health (20.2%). Regarding content, we identified 47 (50%) medical education, 26 (27.6%) patient education, 16 (17%) patient experience, and five (5.3%) surgical procedure videos involving patients with uveitis. While the most popular videos were uploaded by doctors other than ophthalmologists, the videos uploaded by academic institutions and associations of healthcare professional were found to have higher educational quality and reliability scores.

Conclusions: Uveitis videos on YouTube are of poor quality and reliability and are not adequately educational for patients. Therefore, physicians must be aware of the limitations of YouTube and ensure the flow of correct medical information to patients.
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August 2022

The electromyographic analysis of orbicularis oculi muscle in epiphora.

Indian J Ophthalmol 2022 Jun;70(6):2094-2100

Department of Ophthalmology, Kartal, Dr. Lutfi Kirdar City Hospital, Istanbul/, Turkey.

Purpose: Functional epiphora is a clinical condition that presents with the complaint of watery eyes, but without anatomical stenosis in the lacrimal drainage system. Although the mechanism is not clear, there are various possibilities involving the movement of the orbicularis oculi muscle, especially its deeper segment (Horner's muscle). We aimed to evaluate the function of the orbicularis oculi muscle in patients with patent, but dysfunctional lacrimal drainage system using a quantitative motor unit potential (MUP) analysis.

Methods: Twenty-eight patients with functional epiphora (mean age = 59 years) and a control group of 28 volunteers were included in the study. Inclusion criteria were persistent and symptomatic epiphora or wiping >10 times per day and diagnosis confirmation by lacrimal irrigation test. Electromyography (EMG) was performed on the deeper segment of the orbicularis oculi muscle (medial and lateral parts). MUP parameters (duration time, amplitude, number of phases, number of turns, area, rise time, and thickness) were evaluated in both groups. Any increase in amplitude, prolongation time (>14 ms), number of turns, and satellite potential was taken as characteristic of the neurogenic type of epiphora, whereas shortened motor unit duration time, increased phase number, and low amplitude are the features of myopathic type.

Results: Upon MUP analysis of the medial and lateral orbicularis oculi muscle, the increase in duration and thickness values in the medial part and the increase in duration, amplitude, area, and thickness values of the lateral part were found to be statistically significant in the patient group compared to the control group (P < 0.001). In the evaluation of the patients' medial and lateral orbicularis oculi muscle, the increase in phase values and decrease in amplitude, area, and rise time values were found to be statistically significant (P = 0.024, P < 0.001, P < 0.001, and P = 0.010, respectively).

Conclusion: These data show that functional epiphora is due to neurogenic damage of the orbicularis oculi muscle and should be investigated in more detail.
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June 2022

Peripapillary retinal nerve fiber layer and ganglion cell-inner plexiform layer changes on optical coherence tomography in patients with unilateral hypertensive cytomegalovirus anterior uveitis.

Photodiagnosis Photodyn Ther 2021 Mar 15;33:102132. Epub 2021 Jan 15.

Boyabat 75th Year State Hospital, Department of Ophthalmology, Sinop, Turkey. Electronic address:

Purpose: To investigate whether peripapillary retinal nerve fiber layer (pRNFL) and macular ganglion cell-inner plexiform layer (GCIPL) thinning are present in patients with unilateral hypertensive Cytomegalovirus anterior uveitis (hCMV AU).

Methods: We included 19 eyes with unilateral hCMV AU and their unaffected fellow eyes as the control group in this study. Peripapillary RNFL and macular GCIPL changes were determined using spectral-domain (SD) - optical coherence tomography (OCT).

Results: The overall calculated mean pRNFL thickness was significantly lower in the effected eyes with hCMV AU than in the uneffected fellow eyes (p = 0.012). The mean macular GCIPL thickness in the affected eyes was also significantly lower than in the normal eyes (p < 0.001).

Conclusion: Measurement of pRNFL and macular GCIPL thickness with OCT may detect signs of damage before the visual field changes in patients with hypertensive CMV AU. Early aggressive treatment in these patients may prevent further glaucomatous damage.
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March 2021

A Rare Cause of Hypopyon Anterior Uveitis: Relapsing Polychondritis.

Arch Rheumatol 2020 Mar 6;35(1):142-145. Epub 2019 Nov 6.

Department of Ophthalmology, Medical Health Sciences University, Kartal Dr. Lütfi Kırdar Training and Research Hospital, Istanbul, Turkey.

Relapsing polychondritis (RP) is a rare multisystemic disease. It affects cartilage and proteoglycan-rich structures. Ocular findings are the most frequent systemic involvement of the disease. The most common ocular manifestations are episcleritis and scleritis. During the course of the disease, uveitis may also be seen. However, as far as we know, nongranulomatous anterior uveitis with hypopyon is an uncommon ocular finding. In this article, we report a 27-year-old male patient who presented with hypopyon anterior uveitis as a revealing manifestation of RP.
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March 2020