ABSTRACT
Comparison of pachymetry pattern of OCT finding in Keratoconus [KCN] suspect and normal subjects. Thirty-two KCN suspect eyes and Thirty- eight normal eyes in young subjects [20-30 year- old] were evaluated. Pachymetry pattern of frequency domain OCT [Visante] in different parts of cornea [thinnest point, inferior - superior thickness difference, inferior temporal - superior nasal thickness difference and thinnest point in 0-2 millimeter decent ration] were measured. There was a significant [p<0.0001] difference in normal and KCN suspect patients in all measurements. KCN suspects showed thinner cornea and more differences in corneal thickness measurements. Anterior frequency domain OCT seems to be suitable for evaluation of KCN suspect patients. It may be critical for refractive surgery candidate and may be used as Pentacam or OrbScan corneal imaging systems
ABSTRACT
To evaluate residual refractive errors after cataract surgery and its determinant factors at Farabi Eye Hospital, Tehran. Simple random sampling was done among cataract surgery scheduled patients over a 4 year period [2003-2006]. Exclusion criteria were uveitis, previous intraocular surgery and ocular trauma. After applying the exclusion criteria, 423 patients were studied. Lens calculation was performed using the SRK-II formula. Unexpected refractive errors were defined as the difference between postoperative refractive errors with target refraction. Mean and percentage of this variable were reported based on 0.5, 1 and 2 D of ametropia. Of 558 studied patients, 78.1% had biometric data before and refractive data after surgery. Mean absolute unpredictable refractive error was 0.84 +/- 0.89 D. Eyes with normal axial length [AL] had the least [0.76 +/- 0.84] and those with long AL had the most unpredictable refractive errors [P<0.001]. 45.9%, 73.9%, and 91.7% of the study cases had refractive errors within 0.5, 1 and 2 D of emmetropia, respectively. Eyes with short AL had positive refraction and those with long AL had negative refraction after surgery. The majority of keratometric astigmatism followed extra-capsular surgery while the least measures were associated with phacoemulsification [P<0.001]. Axial length was one of the important factors influencing residual refractive errors after cataract surgery. Unpredictable refractive errors were more common in eyes with long and short AL than those with normal AL
ABSTRACT
To report the result of limbal autografting in primary and recurrent pterygium. In this case series, all patients who were referred to our clinic at Farabi hospital, Isfahan, Iran for treatment of pterygium were included. Indications of surgery included chronic ocular irritation, impaired or threatened vision, ocular motility problem and cosmetic reasons. Under subconjunctional anesthesia, pterygium was removed from the cornea and conjunctiva and a crescent shape limbal tissue from supratemporal region of the same or the sound eye was then prepared and sutured in the area of pterygium removal. In cases with conjunctival problem due to previous surgery or severity of the disease, some amount of conjunctival tissue was also included in the transplanted limbal tissue. Postoperatively, topical betamethasone for 4 weeks and antibiotic for 2 weeks were prescribed. Two-hundred and three eyes were studied of which, 125 eyes [61.6%] had primary and 78 eyes [38.4%] had recurrent pterygium. After at least one year of follow-up, only 9 eyes [4.5%] had recurrence larger than 1 mm. Visual acuity and refraction improved in 60% of the eyes. No significant complication occurred except appearance of a fibrous tissue in the donor site which was not progressive and was covered by the upper lid in all cases. Surgical removal together with limbal autograft is a safe and effective method for treatment of primary and recurrent pterygium
ABSTRACT
To report a case of diffuse lamellar keratitis [DLK] 9.5 months after laser in situ keratomileusis [LASIK] associated with a corneal foreign body. A 32-year-old male developed DLK two days after removal of an intraepithelial corneal foreign body 9.5 months after noncomplicated LASIK. DLK was eliminated after two weeks of topical steroid application and visual acuity returned to the previous level. Post-LASIK eyes may develop DLK triggered by corneal foreign bodies for a long time after the procedure
ABSTRACT
Purpose: to evaluate the prevalence of cataract, lens opacity, and other conditions of the lens among residents of Tehran aged 40 or above, Tehran-Iran
Methods: this study was performed as a part of the population based study on the prevalence of glaucoma among citizens older than 40 in Tehran. A total of 2 160 participants joined the study [50% response rate]. After performing a medical history interview, all participants were examined according to a standard protocol including refraction, visual acuity testing, and slit-lamp biomicroscopy of the anterior segment. Cataract was diagnosed as any lens opacity with visual acuity of 20140 or less in the absence of other causes of visual loss
Results: the prevalence of lens opacity among right eyes, left eyes, and overall was 29.4%, 30.6%, and 32.4%, respectively. Prevalence of cataract was 8.1% in right and 9.1% in left eyes, respectively. The overall prevalence of cataract was 12%. The rate of pseudophakia or aphakia was 3.9% in right or left eyes and 5.2% overall. The prevalence of cataract in male and female subjects was 14.3% and 10.6%, respectively. The prevalence of cataract among adults older than 50 [17.1%] was 9 times that of the 40-49 age group [1.9%]. The prevalence of lens opacity among males and females was 39.1% and 28.3%, respectively. The prevalence of lens opacity among adults older than 50 [45.7%] was more than 7 times that of the 40-49 age group [6.3%]. The prevalence of grade II lens opacification or over was 33.4%. The most frequent type of lens opacity was nuclear sclerosis followed by cortical and posterior subcapsular opacities
Conclusion: the prevalence of cataract and lens opacity in residents of Tehran aged 40 or over is significant especially among elderly indivisuals and it may be estimated that 240,000 persons in Tehran population have cataract and 648,000 have lens opacity, which is a matter of concern for our health system