Prevalence and Risk Factors of Retinopathy of Prematurity in Iran

Purpose: The present study aimed to evaluate the frequency and risk factors of retinopathy of prematurity (ROP) among Iranian infants. Methods: A retrospective cohort study was conducted on infants who had undergone screening for ROP at Farabi Eye Hospital, between March 2016 and March 2017. Data were analyzed based on the presence of extreme prematurity (gestational age ≤ 28 weeks), extremely low-birth-weight (≤ 1000 g), and multiplegestation (MG) infants. Results: The prevalence of ROP was 27.28% (n = 543) among all screened infants, 74.4% for extremely preterm (EP) infants, 77.5% for extremely low birth weight (ELBW) babies, and 27.25% for infants from MG pregnancies. On multivariate analysis, gestational age, birth weight, and history of transfusion (P < 0.0001, P < 0.0001, and P = 0.04, respectively) were found to be significantly associated with ROP. More advanced stages of ROP (P < 0.0001) were observed in EP and ELBW infants. Birth weight (P = 0.088), history of transfusion (P = 0.066), and intubation (P = 0.053) were not associated with increased risk of ROP in EP infants, while gestational age (P = 0.037) and history of transfusion (P = 0.040) were significant risk factors for ROP in ELBW infants. Gestational age (P < 0.001) and birth weight (P = 0.001) were significantly associated with ROP in infants from MG pregnancies in multivariate analysis. Conclusion: ROP remains a commonly encountered disease, especially in ELBW and EP infants. The history of transfusion may have a role in stratifying the risk for ROP and guiding future screening guidelines

Idiopathic macular telangiectasia type 2: A six-year study with multimodal imaging of a presumed unilateral case

Purpose: To present a rare manifestation of macular telangiectasia type 2 (MacTel type 2) followed up for over six years. Methods: A 61-year-old woman with one year history of blurred vision of her left eye was referred. Results: Whereas the funduscopy, spectral-domain optical coherence tomography (SD-OCT), fluorescein angiography (FA), and fundus autofluorescence (FAF) were normal in the right eye, they revealed noticeable findings typical of MacTel type 2 in the left eye. After over six years follow-up, OCT-angiography (OCTA) showed no remarkable difference between the two eyes, and en face OCT showed subtle abnormal change in the right eye as well as typical pathological changes in the left eye. Conclusion: MacTel type 2 can present unilaterally and remain so for a long time. The role of multimodal imaging in diagnosis and follow-up is of utmost importance. Keywords: Unilateral, Macular telangiectasia type 2, Multimodal imagin

Comparison of intravitreal bevacizumab injection and laser photocoagulation for type 1 zone II retinopathy of prematurity

Purpose: To compare the efficacy of intravitreal bevacizumab (IVB) injection with conventional laser photocoagulation in eyes with type 1 zone II retinopathy of prematurity (ROP). Methods: Preterm infants with type 1 ROP in zone II (stage 2 or 3 ROP with plus disease) were randomly assigned to intravitreal injection of 0.625 mg/0.025 ml bevacizumab (Group 1) or laser photocoagulation (Group 2). Patients were followed weekly for 4 weeks and then biweekly till 90 weeks gestational age. Also, spherical and cylindrical refractive errors were compared at 90 weeks postmenstrual age (PMA). Results: A total of 116 preterm infants (232 eyes) were treated and completed the follow-up period. IVB injection was done in 154 eyes (77 cases), and laser photocoagulation was done in 78 eyes (39 cases). ROP regressed after single IVB injection in 149 eyes (96.8%) and in 5 eyes (3.2%) after the second injection. Cataract developed in one eye (0.63%) after IVB injection. ROP regressed in 94.7% of treated eyes (76 eyes) in the laser photocoagulation group; however, retinal fold and traction developed in 2 eyes. Spherical and also cylindrical refractive errors had no significant difference. Conclusions: Both IVB injection and laser photocoagulation are effective methods for the treatment of type 1 zone II ROP. However, re-treatment requirement may be higher in the IVB injection group. IVB re-injection is an effective option for re-treatment in persistent cases. Keywords: Retinopathy of prematurity, Bevacizumab, Avastin, Laser photocoagulation, Zone I

Associations of refractive amblyopia in a population of Iranian children

Background: To determine the factors associated with amblyopia in a referral clinical population. Methods: In this cross-sectional study, 164 subjects who were referred to an amblyopia clinic were enrolled and divided into two groups: refractive amblyopia group and refractive non-amblyopia group. Visual acuity, refractive measurements, and information on birth parameter and delivery mode were compared between both groups. Results: We included 164 children (91 children in the non-amblyopic group and 73 children in the amblyopic group) aged 5–10 years. 50.6% of children with amblyopia had anisometropia, defined as a difference among eyes in spherical equivalent of 1.00 D or more. The regression analysis revealed that amblyopia was strongly associated with hyperopia ≥2.00 D (odds ratio, 10.0; 95% CI, 3.27–30.58), anisometropia ≥1.00 D (odds ratio, 7.78; 95% CI, 3.64–16.61), astigmatism ≥1.00 D (odds ratio, 5.23; 95% CI, 2.48–11.02), and myopia ≥−2 D (odds ratio, 6.96; 95% CI, 1.9–25.28). There were also significant associations of amblyopia with low birth weight (≤2500 g), preterm birth (≤37 weeks), and dystocia (all P < 0.001). Conclusion: Prematurity, low birth weight, and dystocia as well as refractive errors were associated with amblyopia in our select patient population

Efficacy of intravitreal bevacizumab for the treatment of Zone I Type 1 retinopathy of prematurity

Purpose: To describe the efficacy of intravitreal bevacizumab for the treatment of type 1 retinopathy of prematurity (ROP) in zone I. Methods: Preterm infants with type 1 ROP in zone I (zone I ROP, any stage with plus disease or zone I ROP, stage 3 without plus disease) were enrolled in this prospective study. Intravitreal bevacizumab (0.625 mg/0.025 ml) was injected under topical anesthesia. Patients were followed weekly for 4 weeks and then biweekly till 90 weeks gestational age. Results: Seventy eyes of 35 patients with type 1 ROP in zone I were enrolled. At a gestational age of 90 weeks, ROP regressed with complete or near-complete peripheral retinal vascularization, in 82.9% of eyes after a single injection and in 92.9% of eyes after up to two injections. In five eyes (7.1%), ROP progressed to stage 4B or 5, so surgical management was required. There were no major complications such as endophthalmitis, cataract, or vitreous hemorrhage after injection. Conclusion: Intravitreal bevacizumab injection is an effective method for the management of patients with Zone I ROP requiring treatment; however, some cases may progress to more advanced stages and require surgical management. Close monitoring for recurrence or progression is necessary. Eyes with persistent zone I ROP may progress to advanced stages when treated with intravitreal bevacizumab injection and re-treatment may be needed

Subfoveal Choroidal Thickness after Panretinal Photocoagulation with Red and Green Laser in Bilateral Proliferative Diabetic Retinopathy Patients: Short Term Results

Purpose. To compare subfoveal choroidal, central retinal, and peripapillary nerve fiber layer (RNFL) thickness after panretinal photocoagulation (PRP) with red and green laser in diabetic patients. Study Design. Randomized clinical trial. Methods. A total of 50 patients with bilateral proliferative diabetic retinopathy and no diabetic macular edema underwent PRP. One eye was randomly assigned to red or green laser. Subfoveal choroidal, central retinal, and RNFL thicknesses were evaluated at baseline and 6 weeks after treatment. Results. The mean subfoveal choroidal, central retinal, and peripapillary nerve fiber layer (RNFL) thickness increased significantly in each eye 6 weeks after PRP (P values in red laser group: <0.01, 0.03, and <0.01, resp., and in green laser group <0.01, <0.01, and <0.01). There was no difference between red and green laser considering subfoveal choroidal, central retinal, and peripapillary nerve fiber layer (RNFL) thickness increase after PRP (P values: 0.184, 0.404, and 0.726, resp.). Conclusion. Both red and green lasers increased mean subfoveal choroidal, central retinal, and peripapillary nerve fiber layer (RNFL) thickness significantly 6 weeks after PRP, but there is no difference between these two modalities in this regard

Comparison of Breast Milk and Sucrose in Neonatal Pain Relief and Coping with Stress of ROP Examination Using ALPS-Neo

Background: Examination for retinopathy of prematurity (ROP) is one of the procedures that can be stressful for neonates admitted to a neonatal intensive care unit. This study compared breast milk and sucrose in pain relief and coping with the stress of ROP examination using the Astrid Lindgren and Lund Children’s Hospital Pain and Stress Assessment Scale for Preterm and Sick Newborn Infants (ALPS-Neo). Methods: The present study was carried out on a total of 63 preterm infants (including breast milk group [n=21], sucrose group [n=21], and distilled water group [n=21]). The neonates were given 0.5 ml/kg of breast milk, sucrose, or distilled water 2 min before the examination. The ROP eye examinations were video recorded from 5 min before to 15 min after the examination, and infants’ pain and stress levels were assessed using the ALPS-Neo by two blinded evaluators 5 min before, during, and 5, 10, and 15 min after the examination. Results: No statistically significant differences were observed during the examinations in the mean scores of the ALPS-Neo among the three groups (P>0.05). However, there were statistically significant differences among the three groups after the examinations (P<0.05) and in the mean duration of stress adaptation (P<0.05). The duration of stress adaptation in the breast milk group was 11.4 min on average which was lower than that reported for the other groups. ConclusiConcluConclusion  Conclusion: Breast milk was more effective in the reduction of pain and stress after ROP examinations, compared to sucrose or distilled water

Mini-scleral contact lens for management of poor visual outcomes after intrastromal corneal ring segments implantation in keratoconus

Purpose: To evaluate the feasibility and efficacy of mini-scleral design (MSD) contact lenses to treat keratoconus patients who were unsatisfied with the results of corneal inlay. Methods: In this prospective interventional case series, 9 eyes of 6 keratoconus patients who were unsatisfied with the results of corneal inlay were fitted with MSD contact lenses. Demographic data, uncorrected visual acuity (UCVA), best spectacle-corrected visual acuity (BSCVA), and higher order aberrations (HOAs) were evaluated before contact lens fitting. Corrected visual acuity by placing the MSD contact lens with or without over-refraction, and HOAs were measured one hour after contact lens fitting. One month after contact lens wearing, corrected visual acuity by placing the MSD contact lens with over-refraction and possible contact lens related problems were assessed. Ocular comfort and contact lens handling problems were asked in follow-up visits. The data was analyzed using descriptive statistical tests. Results: Nine eyes of 6 patients were successfully fitted with the mini-scleral lens. Fitting was ideal in 7 eyes and acceptable in 2 eyes. Mean corrected visual acuity by placing the MSD lens without over-refraction was 0.09 (range, 0.00-0.15) LogMAR which was significantly better than the mean BSCVA of 0.38 (range, 0.2-0.6) LogMAR (P = 0.007). The mean root mean square (RMS) of third-order coma and trefoil significantly decreased after MSD contact lens fitting (P = 0.012 and P = 0.015, respectively); however, changes in the fourth-order spherical aberration were not statistically significant (P = 0.336). Conclusion: Mini-scleral contact lenses may be helpful in the management of visually unsatisfied patients after corneal inlay

Foveal structure in macula-off rhegmatogenous retinal detachment after scleral buckling or vitrectomy

Purpose: To evaluate foveal microstructural changes and to determine its association with visual outcomes after reattachment of rhegmatogenous retinal detachments (RRDs) by scleral buckling (SB) or pars plana vitrectomy (PPV). Methods: Using spectral domain optical coherence tomography (SD-OCT), foveal microstructure in eyes with macula-off RRD were studied 1, 3, 6, 9, 12 and 15 months after PPV or SB and correlated with visual outcomes. Results: Forty-two eyes were included in the final analysis. Even with improved microstructural changes and normalization of retinal structures on OCT, final visual acuity was not correlated with microstructural changes in eyes undergoing PPV. In the SB group, final visual acuity was significantly correlated with an intact inner segment/outer segment (IS/OS) junction (P = 0.013). There was no significant correlation between final visual acuity and presence of subretinal fluid (SRF) in either group. Conclusion: After SB, eyes with an intact IS/OS junction had better final visual acuity. In the PPV group, there was no significant correlation between microstructural changes and visual acuity. The presence of SRF did not influence final visual acuity in both groups