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corneal refraction

Konstantinos Droutsas, Myrsini Petrelli, Dimitrios Miltsakakis, Konstantinos Andreanos, Anastasia Karagianni, Apostolos Lazaridis, Chrysanthi Koutsandrea, George Kymionis
Purpose: To examine the impact of graft thickness (GT) on postoperative visual acuity and endothelial cell density after ultrathin-Descemet stripping automated endothelial keratoplasty (UT-DSAEK) versus conventional DSAEK. Methods: The medical records of all patients who underwent DSAEK at our institute during a 2-year period were reviewed. After excluding subjects with low visual potential, 34 eyes were divided into two groups based on the postoperative GT as measured with anterior segment optical coherence tomography (AS-OCT): an UT-DSAEK group (GT ≤ 100  μ m, n =13 eyes) and a DSAEK group (GT > 100  μ m, n =21 eyes)...
2018: Journal of Ophthalmology
Natalie Nguyen, John D Gelles, Steven A Greenstein, Peter S Hersh
PURPOSE: To assess the incidence and motivating determinants of explantation of intracorneal ring segments (ICRS) (Intacs) used for the treatment of keratoconus and corneal ectasia. SETTING: Cornea and refractive surgery subspecialty practice. DESIGN: Retrospective case series. METHODS: Consecutive cases of ICRS implantation performed to treat keratoconus or corneal ectasia were reviewed to determine the number that were eventually explanted and the motivating factors for explantation...
November 30, 2018: Journal of Cataract and Refractive Surgery
Haitham H Al-Mahrouqi, Nasser Al-Shamli, Nirmal Raj Mohan, Saif Bani Oraba, Sathiya M Panchatcharam, Rashid Al-Saidi, Abdulatif Al-Raisi
OBJECTIVE: To determine the demographics and associated clinical features of Omani keratoconus patients presenting to the Ministry of Defence Hospital (MODH) in Muscat. METHODS: This is a retrospective, descriptive study whereby the electronic medical records of all Omani keratoconus patients presenting to the MODH between January 2011 and December 2015 were reviewed. Demographic details, corrected distance visual acuity, refraction, corneal topography, pachymetry, and treatment received were all documented...
September 2018: Oman Journal of Ophthalmology
Steven S Bae, Clara C Chan
INTRODUCTION: To evaluate the indications and outcomes of manual blade superficial keratectomy STUDY DESIGN: Retrospective, nonrandomized, consecutive case series METHODS: Database search of patients from 2012-2017 who underwent superficial keratectomy was conducted at a tertiary care hospital cornea clinic. Charts of 121 patients (156 eyes) were reviewed who had at least 4 weeks of follow-up and both preoperative and postoperative measurements of best-corrected visual acuity or corneal cylinder...
December 2018: Canadian Journal of Ophthalmology. Journal Canadien D'ophtalmologie
Amr Elkamshoushy, Reem Gonnah, Silvana Madi, Jacqueline Beltz
PURPOSE: To report outcomes of femtosecond-assisted single-piece mushroom keratoplasty for the treatment of full-thickness corneal disease in pediatric patients with healthy endothelium. METHODS: Femtosecond-assisted mushroom keratoplasty was performed in 8 eyes of 8 patients (age range, 8-17 years) with central full-thickness corneal opacity. The single-piece mushroom-shaped graft consisted of a large anterior portion (9 mm in diameter; 250 μm in thickness) and a small posterior portion (6-6...
November 27, 2018: Journal of AAPOS: the Official Publication of the American Association for Pediatric Ophthalmology and Strabismus
A A Shpak, S V Kostenev, I A Mushkova, M V Korobkova
The effect of significant changes in corneal power after refractive surgery on the parameters of optical coherence tomography (OCT) has not been sufficiently studied. PURPOSE: To study effects of corneal refractive surgery on optical coherence tomography (OCT) measurements in patients with moderate and high myopia. MATERIAL AND METHODS: OCT was performed in 62 patients (62 eyes) with myopia over 4 D before and one month after LASIK. The changes in 14 parameters of the thickness of the retina, ganglion cell-inner plexiform layer (GCIPL) and peripapillary retinal nerve fiber layer (pRNFL) were analyzed...
2018: Vestnik Oftalmologii
V R Mamikonyan, G A Osipyan, Kh Khraystin
PURPOSE: To provide preliminary estimation of the effectiveness of bandage therapeutic-optical keratoplasty (BTOK; previously called inralamellar bandage keratoplasty) in patients with pellucid marginal corneal degeneration (PMD). MATERIAL AND METHODS: The study included 7 patients (8 eyes) with PMD aged 35 to 55 years operated with intralamellar bandage keratoplasty, the follow-up period comprised 3, 6, and 12 months after the surgery. RESULTS: All patients with PMD operated with intralamellar bandage keratoplasty showed increase in visual acuity to an average of 0...
2018: Vestnik Oftalmologii
V R Mamikonyan, S V Trufanov, L Yu Tekeeva, S A Malozhen, A M Subbot, A A Fyodorov
PURPOSE: To study the effectiveness of polishing Bowman's membrane with a diamond burr (DBPBM) in the treatment of recurrent corneal erosion syndrome (RCES). MATERIAL AND METHODS: The study included 22 patients (22 eyes) with RCES aged 20-56 years who underwent our original modification of DBPBM. All patients had keratotopography examined, endothelial cell density measured, and optical coherence tomography (OCT) of the cornea taken before and after the procedure...
2018: Vestnik Oftalmologii
Mohammed Iqbal, Ahmed Elmassry, Ahmed Tawfik, Mervat Elgharieb, Khaled Nagy, Ashraf Soliman, Hisham Saad, Tarek Tawfik, Osama Ali, Ahmed Gad, Islam El Saman, Alaa Radwan, Hosam Elzembely, Amin Abou Ali, Omar Fawzy
PURPOSE: To compare the safety and efficacy of standard 30 min epithelium-off cross-linking (CXL) versus photorefractive keratectomy (PRK) combined with accelerated epithelium-off cross-linking (AXL) for the treatment of progressive keratoconus (CXL-Plus). METHODS: This study was a prospective multicentre comparative clinical study. A total of 125 eyes of 75 patients with grade 1 keratoconus and documented progression were divided into two groups. Group A included 58 eyes treated with standard CXL...
November 29, 2018: Acta Ophthalmologica
Annemarie Buser, Peter Baumbach, Bettina von Livonius
As an ophthalmologist, it is very important to know whether limited vision is caused by refractive problems or whether there is another pathology behind it. That's why refraction plays a key role at the beginning of every eye examination. Therefore, it is important to know the basic principles of optics. When fitting spherical and cylindrical lenses, it is interesting to know which properties the respective lenses have. One should also be aware of the optical paths and refraction laws when fitting spectacle lenses and prisms...
November 28, 2018: Klinische Monatsblätter Für Augenheilkunde
Huimin Zhang, Taotao Liu, Yujie Li, Haitao Zheng, Shanshan Guo, Jingyao Chen
No abstract text is available yet for this article.
November 27, 2018: Minerva Medica
Mariusz Budaj, Andrzej Michalski, Bogdan Miśkowiak, Katarzyna Filipecka, Sylwia Mandecka
Among patients and health professionals who are exposed to ionizing radiation during diagnostic and therapeutic procedures, refractive errors are common and soft contact lenses are widely used to correct them. Changes in the inner structure of contact lens may influence the safety of its usage through modification of its water content or oxygen accessibility to cornea. Therefore, analysis of impact of external factors, therein ionizing radiation used in medicine, on contact lenses parameters is necessary, particularly to compare the presence of free volume gaps in the structure of the polymer soft contact lenses...
January 2018: Polimery W Medycynie
Pinar Kosekahya, Cemile Ucgul Atilgan, Kadir Gokhan Atilgan, Mustafa Koc, Kemal Tekin, Mehtap Caglayan, Yasin Sakir Goker
PURPOSE: To evaluate the corneal tomographical parameters in patients with familial mediterranean fever and to compare data with those of healthy control subjects. MATERIALS AND METHODS: Forty eyes of 40 patients with familial mediterranean fever (familial mediterranean fever group) and 35 eyes of 35 healthy subjects (control group) were included to this prospective study. All participants underwent complete ophthalmological examination and tomographical analysis with Pentacam HR...
November 27, 2018: Current Eye Research
Ikuko Toda
Post-LASIK dry eye is the most common postoperative dry eye after ophthalmic surgeries. The clinical signs of post-LASIK dry eye include positive vital staining of the ocular surface, decreased tear breakup time and Schirmer test values, reduced corneal sensitivity, and decreased functional visual acuity. The symptoms and signs usually last for about 1 month after LASIK. A small number of patients continue to experience symptoms more than 1 year postoperatively. It has been suggested that the loss of corneal innervation caused by flap-making is the major cause, affecting the corneal-lacrimal gland, corneal-blinking, and blinking-meibomian gland reflexes, resulting in decreased aqueous and lipid tear secretion and mucin expression...
November 1, 2018: Investigative Ophthalmology & Visual Science
Seyed Javad Hashemian, Nooshin Farshchian, Alireza Foroutam-Jazi, Mohammad Ebrahim Jafari, Mahsa Sadat Hashemian, Seyed Mahyar Hashemian
Purpose: To evaluate the visual, refractive, and tomography changes after femtosecond laser-assisted intrastromal corneal ring segment (ICRS; Intacs® SK) implantation in patients with keratoconus. Methods: In this prospective interventional case series, Intacs SK ICRSs were inserted using a femtosecond laser into eyes with stage I-IV keratoconus. Visual, refractive, and corneal tomography changes, along with surgical complications, were analyzed 1 week, 2 months, and 6 months postoperatively...
October 2018: Journal of Ophthalmic & Vision Research
S Mertsch, J Alder, H S Dua, G Geerling
Neurotrophic keratopathy (NK) is a degenerative corneal disease that is based on an impairment of the corneal innervation. The damage to the sensory innervation, which is delivered through the 1st branch of the trigeminal nerve (ophthalmic nerve), can occur throughout the entire length of the nerve from the nucleus in the brainstem, e.g. caused by brain tumors, to the terminal nerve fibers in the cornea, caused for example by refractive corneal surgery (e. g. LASIK). Due to the loss of the sensory innervation, a reduced lacrimation and a reduction in the secretion of trophic factors occur...
November 26, 2018: Der Ophthalmologe: Zeitschrift der Deutschen Ophthalmologischen Gesellschaft
Hakika Erdogan, Ziya Akingol, Ozlem Cam, Sadik Sencan
Purpose: The aim of the study was to statistically compare intraocular pressure (IOP) values measured using noncontact tonometer (NCT), Goldmann applanation tonometry (GAT) with fluorescein (fGAT), and GAT without fluorescein (nGAT). The study was also performed to test whether the values obtained using each technique change in accordance with the central corneal thickness (CCT) and refractive and keratometric values. Study design: This study was a prospective study of 188 eyes of 94 healthy volunteers...
2018: Clinical Ophthalmology
Inger Lüdeke, Johannes Gonnermann, Jørn Jørgensen, Thomas Neuhann, Keith McKay, Mathias Fleischer, Peter Galambos, Ralf-Christian Lerche
PURPOSE: To evaluate the refractive and visual outcomes of arcuate incisions performed with the femtosecond laser in patients with a residual refractive astigmatism after refractive lens exchange (RLE) with trifocal intraocular lenses (IOLs). SETTING: EuroEyes Clinical Group, Hamburg, Germany. DESIGN: Retrospective interventional case series. METHODS: Pseudophakic patients with remaining refractive astigmatism after RLE with a trifocal IOL were treated with femtosecond laser-assisted corneal arcuate incisions...
November 16, 2018: Journal of Cataract and Refractive Surgery
Percy Lazon de la Jara, Jennie Diec, Thomas Naduvilath, Eric B Papas
SIGNIFICANCE: Since becoming a popular form of refractive error correction, contact lenses have aspired to replicate the nonwearer experience. This study assessed how well currently available daily disposable soft lenses have achieved that goal, using a graphical representation to show individual lens behavior relative to benchmarks. PURPOSE: The purpose of this study was to assess comfort, vision, and adverse events during daily disposable contact lens wear, relative to emmetropes and spectacle wearers...
November 16, 2018: Optometry and Vision Science: Official Publication of the American Academy of Optometry
Rie Hoshikawa, Yoshihiko Iida, Takushi Kawamorita, Nobuyuki Shoji
Purpose: We report a case of cataract surgery in a patient with a detectable angle gamma due to macular heterotopia. Observation: A 48-year-old man had angle gamma due to macular heterotopia secondary to retinopathy of prematurity. The preoperative corrected distance visual acuity was 20/32 in the right eye and 20/200 in the left eye. Ocular deviation was esotropic at an angle of 70-80prism diopter. Only the right eye was capable of fixating due to the amblyopia in the left eye...
December 2018: American Journal of Ophthalmology Case Reports
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