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SING IMT in pseudophakic eyes: Results of the first experiences

PurposeTo evaluate the feasibility and outcomes of implanting the Smaller-Incision New-Generation Implantable Miniature Telescope (SING IMT) in pseudophakic patients affected by late-stage dry AMD. SubjectsFive pseudophakic patients’ eyes with stable dry AMD were suitable for SING IMT implantation. Four eyes were excluded because of previous YAG laser capsulotomy. Patients underwent preoperative assessments, including visual acuity measurements and OCT scans. MethodsSurgical procedures were performed under peribulbar anesthesia, with careful IOL removal and SING IMT implantation. Postoperative follow-up was conducted at regular intervals to monitor visual acuity, device positioning and complications. ResultsPostoperative outcomes demonstrated improvements in visual acuity for most patients with an average gain in CDVA (Corrected Distance Visual Acuity) and CNVA (Corrected Near Visual Acuity) of 16,8 ± 10,2 and 13,8 ± 7,4 ETDRS letters, respectively. Limited complications have been observed. In one case, we observed dislocation of the device into the vitreous chamber, which we managed through vitrectomy and scleral fixation of the SING IMT using GoreTex suture. ConclusionsDespite being traditionally contraindicated for pseudophakic patients, SING IMT implantation in selected cases yielded favorable outcomes, indicating potential benefits for this population. Further research with larger sample sizes and longer follow-up periods is warranted to refine patient selection criteria and optimize surgical techniques.

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Inverted internal limiting membrane flap combined with subretinal viscoelastic injection for large or chronic macular holes

PurposeTo report two cases with a large or chronic macular hole (MH) that was closed by combining the inverted internal limiting membrane (ILM) flap technique with the injection of ophthalmic viscoelastic device (OVD) into the subretinal space through the MH. ObservationsA 76-year-old woman was referred to our clinic for surgery of a MH with a maximum diameter of 1089 μm as determined by optical coherence tomography (OCT). Her visual acuity was 20/50 in the left eye after vitrectomy was performed at a local clinic to remove vitreous opacities. For our surgery, the ILM was peeled and the ILM flap was inverted and placed over the MH. Then, cohesive OVD was injected into the subretinal space through the MH to create a retinal detachment around the MH. The MH was closed by a gas tamponade, and the vision improved to 20/40. The second patient was a 62-year-old man whose vision had been decreasing for 3 years, and he was referred to our clinic. His vision was 20/40 in the left eye and OCT detected a MH with a maximum diameter of 853 μm. After core vitrectomy, the ILM was peeled, inverted, and placed over the MH. Then, dispersive and cohesive OVD was injected through the MH. During this procedure, the MH appeared to enlarge and elevate. Then a yellowish arch-shaped lesion appeared at the temporal edge of the macular detachment. The intraoperative OCT showed that the curled-up retinal pigment epithelium (RPE) within the temporal arch-shaped lesion was adherent to the outer retinal layer. Following gas tamponade, the MH was closed but the patient noticed a paracentric scotoma on the nasal side. The fundus autofluorescence (FAF) images showed a hypo-autofluorescent lesion corresponding to the RPE defect. At postoperative 4 months, his visual acuity had improved to 20/22 and the OCT image showed that the MH was closed with a recovery of the ellipsoid zone of the photoreceptors. The subjective paracentric scotoma disappeared, however the hypo-autofluorescent lesion persisted. Conclusions and importanceA combination of the inverted ILM flap and the subretinal injection of OVD can close a large or chronic MH. An RPE detachment caused by injecting OVD into the subretinal space should be avoided.

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A GUCY2D variant associated cone-rod dystrophy with electronegative ERG: A case report and review

PurposeCone-rod dystrophies (CORD) are inherited retinal dystrophies characterized by primary cone degeneration with secondary rod involvement. We report two patients from the same family with a dominant variant in the guanylate cyclase 2D (GUCY2D) gene with different phenotypes in the electroretinogram (ERG). ObservationsA 21-year-old lady (Patient 1) was referred due to experiencing blurry vision and color vision impairment. Visual field testing revealed a central scotoma. Spectral-domain optical coherence tomography (SD-OCT) and fundus autofluorescence (FAF) documented macula dysfunction. Reduced amplitude was observed in the photopic responses of ERG. Her 54-year-old father (Patient 2) had similar issues with blurry vision. A dilated fundus examination displayed bilateral macular atrophy. Loss of the ellipsoid zone line and collapse of the outer nuclear segment were noted on the SD-OCT. Photopic ERG responses were extinguished, and an electronegative ERG was observed in the dark-adapted 3.0 ERG. The gene report revealed a c.2512C>T (p.Arg838Cys) variant in GUCY2D for both patients. They were respectively diagnosed as cone dystrophy (COD) and cone-rod dystrophy (CORD). ConclusionsWe report two different clinical phenotypes in GUCY2D-associated COD despite sharing the same variant. A dysfunction in the synaptic junction between the photoreceptor and the secondary neuron was proposed to explain the electronegative ERG. This explanation might extend to other gene-related cases of CORD with electronegative ERG.

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Intravitreal anti-vascular endothelial growth factor therapy in the treatment of vision loss associated with hematologic malignancy

PurposeTo determine the effectiveness of anti-vascular endothelial growth factor (VEGF) therapy in the setting of optic disc edema secondary to hematologic malignancies. ObservationsThe report features two patients (one male, one female) in their 70's with biopsy proven hematologic malignancies who subsequently developed optic disc edema. The patients were commenced on a trial of successive intravitreal Aflibercept 2mg/0.05mL therapy. The best corrected visual acuity for patient 1 improved from 20/50 oculus dexter (OD) and 20/80 oculus sinister (OS), to 20/20 OD (4 lines Early Treatment of Diabetic Retinopathy Study (ETDRS)) and 20/32 OS (4 lines ETDRS). Similarly, patient 2's best corrected visual acuity improved from 20/100 OU to 20/50 OD (3 lines ETDRS) and 20/40 OS (4 lines ETDRS) following initiation of treatment. In addition, optical coherence tomography imaging obtained before and after therapy demonstrated an improvement in both patient's optic disc edema and cystoid macular edema. Conclusions and importanceThe findings of this report suggest that in patients with a known hematologic malignancy, optic disc edema and cystoid macular edema may be amenable to anti-VEGF treatment, especially if there are clinical and angiographic features of vascular endothelial growth factor overexpression.

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