44 research outputs found
The influence of lens position, vault prediction, and posterior cornea on phakic posterior chamber intraocular lens power.
No full textBACKGROUND
Achieving precise refractive outcomes in phakic posterior chamber intraocular lens (pIOL) implantation is crucial for patient satisfaction. This study investigates factors affecting pIOL power calculations, focusing on myopic eyes, and evaluates the potential benefits of advanced predictive models.
DESIGN
Retrospective, single-center, algorithm improvement study METHODS: Various variations with different effective lens position (ELP) algorithms were analyzed. The algorithms included a fixed constant model, and a multiple linear regression model and were tested with and without incorporation of the posterior corneal curvature (Rcp). Furthermore, the impact of inserting the postoperative vault, the space between the pIOL and the crystalline lens, into the ELP algorithm was examined, and a simple vault prediction model was assessed.
RESULTS
Integrating Rcp and the measured vault into pIOL calculations did not significantly improve accuracy. Transitioning from constant model approaches to ELP concepts based on linear regression models significantly improved pIOL power calculations. Linear regression models outperformed constant models, enhancing refractive outcomes for both ICL and IPCL pIOL platforms.
CONCLUSIONS
This study underscores the utility of implementing ELP concepts based on linear regression models into pIOL power calculation. Linear regression based ELP models offered substantial advantages for achieving desired refractive outcomes, especially in lower to medium power pIOL models. For pIOL power calculations in both pIOL platforms we tested with preoperative measurements from a Scheimpflug device, we found improved results with the LION 1ICL formula and LION 1IPCL formula. Further research is needed to explore the applicability of these findings to a broader range of pIOL designs and measurement devices
Inflammatory Response in the Anterior Chamber after Implantation of an Angle-Supported Lens in Phakic Myopic Eyes
No full textPurpose. To evaluate the inflammatory reaction after implantation of an angle-supported foldable acrylic anterior chamber IOL for myopia correction over time. Methods. Adult individuals seeking vision correction with stable myopia >7.0 D were included. Exclusion criteria are anterior chamber depth <2.8 mm, insufficient endothelial cell density, other preexisting ocular conditions, and prior eye surgery. Laser flare photometry and slitlamp examination were performed before and up to 1 year after implantation of an AcrySof Cachet IOL (Alcon Laboratories, Forth Worth, TX, USA). Postoperative treatment comprised antibiotic eye-drops for 5 days and nonsteroidal anti-inflammatory eye-drops (NSAIDs) for 4 weeks. Results. Average laser flare values of 15 consecutive eyes of 15 patients were 8.3±9.7 preoperatively and 19.0±24.2 (1 day), 24.0±27.5 (1 week), 17.6±13.4 (1 month), 14.9±15.4 (3 months), and 10.0±7.0 (1 year) photon counts/ms after implantation, respectively. Slitlamp examination yielded 0 or 1+ cells (SUN classification) in every one eye throughout the follow-up period. Conclusion. Results indicate a low maximum inflammatory response and a quick recovery to a long-term safe level. The use of NSAIDs seems sufficient in routine cases, thus avoiding potential drawbacks of using corticoids
Five stories of Edgar Allan Poe and some hidden abnormal behaviour in man
No full textBu tezin, veri tabanı üzerinden yayınlanma izni bulunmamaktadır. Yayınlanma izni olmayan tezlerin basılı kopyalarına Üniversite kütüphaneniz aracılığıyla (TÜBESS üzerinden) erişebilirsiniz.Sosyal Bilimler Enstitüsü, İngiliz Dili ve Edebiyatı Ana Bilim DalıSUMMARY (TURKISH) Lise ve üniversite öğrencilerinin bir kısmı, duygusallık ve hüznün incelikle işlendiği Edgar Allan Poe'nun Annabel Lee şiirini ilgi çekici bulur ve zevkle okurlar. Buna karşılık dehşet ve acımasızlığın öne çıktığı aynı yazarın yazdığı öyküler, insan ruhunun karanlık yönleri ile okuyucuyu irkiltir. Bu inceleme nefret, şiddet ve acımasızlığın konu alındığı, bir anlamda sözde korku yaratan durumların kullanıldığı Poe'nun beş öyküsü üzerinedir. Bu çalışmanın amacı, sözü edilen eserlerdeki olaylar zincirinin yüzeysel akışı içerisinde korku duygusunun nasıl işlediğine bakmak, buna bağlı olarak kişinin gerçekten korkmasına neden olabilecek etkenleri görmenin önemini vurgulamaktır. Giriş bölümünde Edgar Allan Poe'nun özgeçmişini ve edebi kişiliği ile ilgili bilgi ile birlikte öykü ve öykü çeşitlerine ilişkin genel bir bakış açısı sunulmuş, literatürde Poe'nun eserleri üzerine olan düşüncelerin sınırlı bir araştırması verilmiştir. İkinci bölümde incelemeye aldığımız öykülerin kısa birer özeti sunulmuş, üçüncü bölümde korku çağrıştıran durumlar ele alınmış, dördüncü bölüm ise gerçekten korkulması gereken durumlar üzerine bir yorum getirmiştir. Beşinci ve son bölümde Poe'nun incelediğimiz beş öyküsünden ders alınması gereken satırarası gönderiler belirtilmiştir.ABSTRACT Some high and university students find, it interesting and read with joy Edgar Allan Poe's poem, Annabel Lee, in which the sentiment of utmost grief is rendered. Contrary to this, Poe's stories, where human capacity for conducting evil is highly augmented, petrifies the reader. This work is about five of Poe's stories, in which the author focuses on violence, hatred and severity, utilising various ways to create a seemingly fearful atmosphere. The aim in this study is to show how important it is for man to be aware of the facts which should generate not baseless but justifiable fear as he may end up getting irretrievable harm. Poe's background and his literary profession, story as a literary style together with types of stories are briefly touched upon, and some literature on Poe's work is provided in introduction. Short summaries of five stories of Poe's which are picked up to be' studied for this thesis, are furnished in chapter two. In chapter three the devices Poe utilises to create fear are taken up whereas in chapter four this author's interpretation of Pop's work is presented. In the fifth and last chapter, the messages which, in our opinion, the reader should not miss in Poe's work, are given as closing remarks
