Publications by authors named "Hirotsugu Takashina"
Purpose: We examine the safe removal of a sticky silicone oil (SO) with an inconspicuous perfluorocarbon liquid (PFCL) layer.
Methods: In the first experiment, we injected PFCL into the SO bubble on the bottom of a transparent container or into the chili oil layer of an immiscible droplet composed of PFCL and chili oil on the posterior retina of a vitrectomized pig eye, in order to release the SO bubble or the chili oil layer from the downward adhesion. In the second experiment, we sucked out the SO layer of an immiscible droplet composed of PFCL and SO on the bottom of a transparent container or on the posterior retina of a vitrectomized pig eye using a fragmatome.
Purpose: To examine the influence of perfluorooctane (PFO) in the formation of sticky silicone oil (SO).
Methods: We performed in vitro experiments using PFO, SO, aqua, and canola oil (CO). The surface tension of CO relative to aqua is very close to that of SO or PFO.
Background: Subthreshold photocoagulation is one of the treatments for diabetic macular edema. However, the range of adequate laser energy that can be used for subthreshold photocoagulation is very restricted. Therefore, determination of the titration settings for the threshold energy is an essential part of the subthreshold-photocoagulation procedure.
View Article and Find Full Text PDFBackground And Objective: To evaluate full-thickness macular hole (MH) formation in the postoperative period after initial vitrectomy for rhegmatogenous retinal detachment (rRD).
Materials And Methods: We retrospectively reviewed the medical records of 4 consecutive eyes that required additional vitrectomy for full-thickness MH between April 2013 and March 2016 after undergoing an initial vitrectomy for rRD.
Results: Epiretinal membrane (ERM) was identified by preoperative optical coherence tomography or intraoperative dye staining in each case.
Purpose: The purpose of this study was to compare perioperative intraocular pressures (IOPs) in 25- or 27-gauge microincision vitrectomy surgery (MIVS) and to evaluate the stability of postoperative sclerotomy closure.
Materials And Methods: This is a retrospective review of 147 eyes treated for epiretinal membrane by using 25- or 27-gauge MIVS as the initial vitrectomy (25-gauge phacovitrectomy [25-P group]: 73 eyes, 25-gauge vitrectomy alone [25-A group]: 15 eyes, 27-gauge phacovitrectomy [27-P group]: 47 eyes, and 27-gauge vitrectomy alone [27-A group]: 12 eyes). Statistical analyses of perioperative IOPs on preoperative day (PreOp), postoperative day (POD)1, POD2, postoperative week 1, and postoperative month 1 were performed.
Background: Characteristic complications have been reported for transconjunctival sutureless vitrectomy, such as postoperative sclerotomy leakage and postoperative hypotony. Particular attention to sclerotomy closure is required in cases of silicone oil tamponade, because postoperative supplementation of silicone oil implies reoperation, whereas postoperative supplement of gas is comparatively easy. This study investigated sclerotomy closure in cases of silicone oil tamponade using 25-gauge transconjunctival sutureless vitrectomy.
View Article and Find Full Text PDFBackground: We investigated changes in corneal thickness following combined cataract and vitreous surgery and determined whether such changes could be used as a criterion for evaluating the invasiveness of combined surgery.
Methods: This retrospective, consecutive, comparative study examined 35 eyes that had undergone combined cataract and 23-gauge vitrectomy for epiretinal membrane (ERM) (18 eyes) and rhegmatogenous retinal detachment (RRD) (17 eyes). Corneal thickness was measured before, 1 day, 1 week, and 1 and 3 months after the surgery.
Background: The purpose of this study was to investigate postoperative intraocular pressure (IOP) in cases of silicone oil (SO) removal when using 25-gauge transconjunctival sutureless vitrectomy (TSV) with oblique incisions.
Methods: We enrolled ten consecutive eyes with SO removal (SO group) and eleven consecutive eyes with idiopathic epiretinal membrane (ERM) as the initial vitrectomy (ERM group) in cases using 25-gauge TSV with oblique incisions. Postoperative IOPs were compared between the two groups at each of the four examination periods.
Background: The purpose of this study was to investigate factors influencing self-sealing of sclerotomy performed under gas tamponade in 23-gauge transconjunctival sutureless vitrectomy.
Methods: This study was a retrospective review of 84 patients (84 eyes) who underwent 23-gauge transconjunctival sutureless vitrectomy under gas tamponade by a single surgeon. At the end of surgery, the sclerotomy was massaged to promote self-sealing.
Introduction: To investigate whether a previous history of vitrectomy affects sclerotomy self-sealing under gas tamponade in 23-gauge transconjunctival sutureless vitrectomy.
Materials And Methods: This study retrospectively reviewed two groups, a vitrectomized group (seven consecutive cases) and an initial vitrectomy group (82 consecutive cases), who underwent 23-gauge transconjunctival sutureless vitrectomy at Jikei University School of Medicine Daisan Hospital in Tokyo. Factors affecting sclerotomy self-sealing were examined using multiple regression analysis.
Factors predicting duration of intraocular gas presence after 23-gauge transconjunctival sutureless vitrectomy for rhegmatogenous retinal detachment.
Ophthalmic Surg Lasers Imaging Retina
December 2014
Background And Objective: To investigate factors predicting duration of intraocular gas presence in 23-gauge transconjunctival sutureless vitrectomy.
Patients And Methods: Retrospective review of 130 eyes that underwent 23-gauge transconjunctival sutureless vitrectomy. At the end of surgery, gas exchange and sclerotomy massage to promote self-sealing were performed.
Background: Patients with angioid streaks are prone to developing subretinal hemorrhage after ocular or head injury due to the brittleness of Bruch's membrane. However, there have been no reports of any angioid streak patients in whom choroidal neovascularization occurred after vitrectomy surgery. We report herein a patient with angioid streaks who developed choroidal neovascularization after vitrectomy surgery for epiretinal membrane.
View Article and Find Full Text PDFPurpose: We investigated changes in corneal thickness following vitreous surgery and determined whether such changes can be used to evaluate the invasiveness of a vitrectomy.
Patients And Methods: This retrospective, consecutive, comparative study examined 20 eyes that had undergone 23-gauge vitrectomy. Corneal thickness was measured prior to as well as following 1 week, 1 month, and 3 months after surgery.
Purpose: We investigated the effects on corneal shape of suturing the scleral wound during 23-gauge vitreous surgery.
Methods: We used a corneal topographic modeling system to measure the corneal shape in 39 eyes of 39 patients before and at 1 week, 1 month, and 3 months after performing 23-gauge vitreous surgery. We investigated the immediate postoperative changes and the postoperative changes over time according to whether suturing was performed.
The purpose of this study was to report a patient with acute zonal occult outer retinopathy (AZOOR) unilaterally, who received steroid pulse therapy. A 42-year-old woman presented with photopsias and severe vision loss in her left eye. Visual acuity was 0.
View Article and Find Full Text PDFAn Alcon AcrySof MA50BM intraocular lens (IOL) with an optic diameter of 6.5 mm can be implanted without further enlarging a 3.0 mm phacoemulsification incision.
View Article and Find Full Text PDF