Choroidal Neovascular Membrane: Made Easy For Postgraduates
Introduction Choroidal neovascularization (CNV) or choroidal neovascular membrane (CNVM) is a growth of new choroidal vessels into the subretinal space through breaks in the Bruch's membrane. Ophthalmoscopically the CNVM appears as a greenish-grey lesion, often with a detachment of the sensory retina, subretinal blood, and exudates. Choroidal neovascularization can be multifactorial with the c...Read More
Chief Complaint: A 12-year-old boy presented with redness and a decrease in vision in the left eye within four hours of injury with a top. History of Present Illness: Redness and decrease in vision in the left eye. No other significant complaint. Past Ocular History: No H/O any previous injury. Past Medical History/ History of Medication: No significant ocular past history for which he has used me...Read More
Intravitreal Injections -technique and tips
Intravitreal injections involve injecting therapeutic agents (drugs/air/gases) inside the vitreous cavity through pars plana under aseptic precautions Surgical anatomy Site of injection: Pars plana Ciliary body: Consists of two parts a) anterior pars plicata b) posterior pars plana Pars plicata Circumferential zone 2.5mm in anteroposterior diameter Pars plana Varies in anteroposterior diameter nas...Read More
Modern imaging modalities in the field of the retina have expanded our understanding of common pathologies including diabetic retinopathy (DR), age-related macular degeneration (AMD), central serous chorioretinopathy (CSCR), and many rare retinal diseases such as dystrophies, which were poorly understood before. This chapter describes newer emerging techniques in retinal imaging which enables adva...Read More
Introduction Intraocular lymphoma, a great non-infective masquerader occurs intraocularly in either the vitreoretinal( primary vitreoretinal lymphoma PVRL)) or in the uveal space( primary choroidal, iris lymphoma). By definition, PVRL denotes the presence of pathology limited to vitreoretinal space without its occurrence in the central nervous system. The term ‘primary’ is however controversial as...Read More
Lattice degeneration of the retina
Lattice degeneration is a vitreoretinal degenerative process of the peripheral retina with visible lesions that predispose to retinal tears and detachment. Vitreous traction at sites of significant vitreoretinal adhesion is responsible for most retinal breaks that lead to retinal detachment. GOALS of identifying the patients with risk of RD are: Identify patients at risk of RRD Examine patients wi...Read More
Persistent Fetal Vasculature Syndrome
It is a congenital ocular disorder where fetal vasculature persists. It can be either subtle (no disturbance in vision) or severe (profound visual loss) Anatomy The fetal vasculature is composed of two parts: Tunica vasculosa lentis: It is situated anteriorly encircling the lens. It has anterior and posterior divisions. Anterior division has additional attachments to the pupillary frill of the ir...Read More
Introduction Retinopathy of Prematurity (ROP) is a fibrovascular proliferative disorder, which affects the developing peripheral retinal vasculature of premature infants. It is an avoidable cause of blindness in children. The initial signs of ROP are detectable by a few weeks after birth, and the condition progresses rapidly thereafter. This means that screening has to be timely, and there is only...Read More
Pan Retinal Photocoagulation (PRP), Focal Laser & Photodynamic Therapy (PDT) Technique & Tips.
Introduction ‘LASER’ is acronym for “Light Amplification by Stimulated Emission Radiation.” This describes the emission process by which an intense beam of electromagnetic radiation is generated Basic Properties of Laser Always monochromatic (one wavelength) Collimated (all photons run parallel) & focused to a small point Coherent (always in same phase) Highest possible speed Physics Certain subst...Read More
Beginners Guide for Performing Vitrectomy
Know your cutter and machine. Current generation vitrectomy cutters work by guillotine mechanism where vacuum holds the Vitreous fibers and presents it to guillotine blade that severs it in one swift motion without exerting significant on fibers. The cutting process needs a fine balance between the speed of cutting and the “pull” created by the vacuum. Higher cutting rates like 10000 cpm allow the...Read More