Showing 4 results for Cornea
Hashemi H, Miraftab Sm,
Volume 59, Issue 1 (4-2001)
Abstract
PTK (Phototherapeutic Keratectomy) is the use of laser in corneal diseases. We can replace PTK for many other invasive procedures. The objective of this study is the assessment of this procedure in several cases in our practice. This investigation was a retrospective study, which was conducted based on comparison of 11 eyes with corneal eschars, induced by recurrent corneal erosions, pterygium surgery, corneal dystrophies and trachoma from 1994 to 1995. The mean age of cases was 32 years. The mean augmentation rate in hyperopia after one month was 1.5 diopter, and after one year it was 1 diopter. Although in two cases, the cylinder more than one diopter was induced, the mean rate for it was not increased significantly. One patient with recurrent erosion, who had not replied to any treatment, had no any complaint during one year follow up. During the follow up procedure, there were no any cases of vision loss among the patients.
Mohamad Aghazade Amiri, Mozhgan Alvandi , Seyed-Mohammad Naser Hashemian , Seyed-Mahdi Tabatabai ,
Volume 73, Issue 4 (7-2015)
Abstract
Background: In this study were focused on corneal cells changes in keratoconus disease, as there are differences between results of other studies that were done on keratokonic eyes. And the chief purpose was a comparison between keratoconus and normal population based corneal endothelium (in cell density, pleomorphism and polymegethism of cells).
Methods: This study is an observational study and is a case-control type. This study was done in Farabi Ophthalmology Hospital, Tehran, from September 2013 to February 2014. In this study, 26 mild (corneal power is lower than 48 diopter) and moderate (corneal power is between 48 to 54 diopter) keratoconic eyes (case group) with no history of contact lenses wear or eye surgeries were compared with 25 normal eyes (control group) that corneal power based topographic images is lower than 47.2 diopter. This comparison were done based specular microscopy images which were taken by Noncontact (Topcan Sp-2000 P) specular microscope in 5 corneal regions (central, superior, inferior, nasal, temporal). Then the information related to the cell density, Coefficient of Variation (CV) of polymegethism and pleomorphism of cells were analyzed by SPSS software, version 21 (SPSS, Inc., Chicago, IL, USA).
Results: Superior corneal region has the largest amount of endothelial cell density in case and control groups (P<0.001). But the effects of keratoconus on the cell density was not significant (P=0.96). And also CV of polymegethism in two groups (case and control groups), was similar (P=0.828). Pleomorphism was seen in 7 eyes of 26 eyes in case group (26.9%) and 6 eyes of 25 eyes in control group (24%).
Conclusion: Keratoconus does not have any considerable effect on cell density, polymegethism and pleomorphism, in mild and moderate stages and corneal opacity risk caused by intraocular surgeries (such as: Cataract or Glaucoma surgeries) and some diseases (such as diabetes and uveitis) is similar in keratoconic and normal eyes.
Rhoghaye Tighnavard Bejarbane , Roshanak Daie Ghazvini , Shahram Mahmoudi , Reza Soltani Moghaddam, Mahin Safara, Heidar Bakhshi , Parivash Kordbacheh ,
Volume 75, Issue 5 (8-2017)
Abstract
Background: Keratomycosis is a fungal infection of the cornea which could be sight-threatening and even causes eye loss. Considering the high humidity and the dominance of agriculture as important predisposing factors of keratomycosis in north of Iran, this study was carried out for diagnosis of fungal keratitis in patients with corneal lesions in Rasht, Gilan province, Iran.
Methods: This descriptive cross-sectional study was conducted from July 2015 to November 2016 on 56 patients with corneal lesion suspected to keratomycosis and referred to eye emergency ward of Amiralmomenin hospital, Rasht, Iran. Corneal scraping was performed in all cases and specimens were subjected to direct examination and culture. Only colonies grown in sites of corneal scraping inoculation were considered significant. Fungal isolates were identified according to their macroscopic features of colonies and microscopic characteristics in slide cultures. Data were analyzed in SPSS software, version 21 (IBM SPSS, Armonk, NY, USA) and P<0.05 was considered significant.
Results: The patients included 42 (75%) men and 14 (25%) women with the mean age of 49.5 years (9 to 90 years). Positive culture was observed in 9 cases but, only in one of these patients direct examination was positive and fungal elements were seen in 10% KOH preparation. Though, fungal keratitis was confirmed in 9 (16%) patients including seven (77.8%) men and two (22.2%) women. The majority of cases (88.9%) had a history of corneal trauma with plants and they were mainly farmer. According to statistical analysis, there was a significant association between corneal trauma and keratomycosis (P=0.007). The most common etiologic agents were Fusarium spp. (n: 4, 44.4%), followed by Aspergillus flavus (n: 2, 22.2%), Penicillium sp. (n: 1, 11.1%), Acremonium sp. (n: 1, 11.1%), and Cladosporium sp. (n: 1, 11.1%) respectively.
Conclusion: In the presence of sufficient predisposing factors such as corneal injuries caused by plants, keratomycosis could be caused by a variety of fungi. Furthermore, low sensitivity of direct examination in this study, revealed the necessity of culture in diagnosis of keratomycosis. |
Saeed Rahmani, Aliakbar Shafiee, Abbas Riazi , Alireza Akbarzadeh Baghban , Alireza Jafari , Maryam Dashti,
Volume 82, Issue 6 (8-2024)
Abstract
Background: Problems related to blue light exposure are among the various issues experienced by individuals who have undergone Photorefractive Keratectomy (PRK).Given the growing concerns regarding blue light’s effects on visual health, this study aimed to thoroughly investigate the impacts of blue blocker filters on the improvement of vision in patients post-refractive surgery of the PRK type. The primary objective was to evaluate the overall effectiveness of these filters in enhancing visual quality and in reducing complications associated with the surgery, which can significantly affect a patient’s quality of life.
Methods: In a quasi-experimental study conducted from September 1, 2024, to the end of October 2024, individuals who had undergone PRK surgery were examined at the optometry clinic of Dr. Labbafi Nejad Hospital in Tehran. Participants were subjected to assessments both with and without the application of blue blocker filters. Key parameters, including visual acuity and contrast sensitivity among attendees, were meticulously measured under both conditions. The results were then systematically compared and analyzed to draw meaningful conclusions about the impact of blue blocker filters in this context.
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Results: A total of thirty-four participants, comprising 73.5% females and 26.5% males, with an average age of 32.6 years, were incorporated into the study. Post-surgery, the average refraction measured in the right and left eyes was documented as -0.42±0.16 D and -0.30±0.16 D, respectively. Notably, visual acuity in both eyes significantly improved with the use of the blue light blocking filter (P<0.005) Moreover, contrast sensitivity at varying spatial frequencies of 1.5, 6, and 18 cycles per degree (c/d) also exhibited significant enhancement (P<0.005).
Conclusion: The incorporation of blue blocker filters for individuals with a history of PRK surgery has led to noteworthy improvements in visual acuity and enhanced contrast sensitivity. These findings underscore the critical importance of integrating blue light protection in the post-operative care of patients, as it significantly elevates the overall visual experience and may contribute to better long-term outcomes following refractive surgery.
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