Lens in Nepal

  What Is Orthokeratology? ·                Temporary  correction of refractive power ·                Use of rigid gas permeable lenses. ·                 Also known as corneal reshaping, Corneal Refractive Therapy (CRT), Vision Shaping Treatment (VST)   History ·        Early 1960s §   “Orthofocus” §   Average reduction 1.00-1.50D with large variability ·         Limitations §   Lack of long term data §   Keratometry reading only §   Use PMMA lenses §   Effects take weeks to months §   Multiple lens treatment ·        Modern Day Ortho- K §   FDA approval:2002 v Overnight wear and correction of myopia §   Materials v Hyper- DK materials for overnight wear §   Myopia control §   RGP Design v Flatter conventional GP vs reverse geometry §   Use of corneal topography ·         Reverse Geometry Design §   Multi- zone design v 3 or 4 curve design v Secondary curve steeper than base curve ·         Improved treatment centration ·         Improved predictability   How does ortho-k work?

 what is keratoconus? Keratoconus is a vision disorder that occurs when the normally round cornea (the front part of the eye) becomes thin and Irregular(cone) shape. The abnormal shape prevents the light entering the eye from being focused correctly on the retina and causes distortion of vision. What Causes Keratoconus? Doctors do not know for sure why people have keratoconus. In some cases, it appears to be genetic (passed down in families). About 1 out of 10 people with keratoconus have a parent who has it too. Keratoconus is also associated with: Eye Allergies Excessive eye rubbing, and Connective tissue disorders like Marfan Syndrome and Ehlers-Danlos syndrome Symptoms Keratoconus often starts when people are in their late teens to early 20s. The vision symptoms slowly get worse over a period of about 10 to 20 years. Keratoconus often affects both eyes, and can lead to very different vision between the two eyes. Symptoms can differ in each eye, and they can change over time. In the

  What is One Fit Scleral Lens? Onefit scleral lenses are a game-changing contact lens that eliminates the issues of end-of-day dryness, discomfort and fluctuating vision – to name a few.  Onefit scleral lenses provide you with a cushion of tears for all day comfort, protection from wind, dust and debris, consistently crisp vision, and the peace-of-mind to know that your lens won’t pop out under most circumstances, unlike soft lenses.  They also serve as a life-changing option for those that have been intolerant to contact lenses in the past. Advantages * Solves problems other lens can't * Initial comfort (no lens to lid interaction) * Sharp crisp Vvision (like GP Lens) * No debris entrapment under the lens *Masks Corneal astigmatism * Keep the cornea and ocular surface moist * Helps restore ocular surface disorders * Centers well (smaller scleral Lens) WHO ARE THE RIGHT CANDIDATES? 1 . POST DISEASES * Keratitis * Ulcers *  Stevens-Johnson syndrome * PMCD * Dry Eyes * Keratoconus

  CHEMICAL INJURY (MANGO SAP) FITTED WITH ONEFIT MED SCLERAL LENS KRISHNA KUMAR DHANKHOTIˡ , DR.SUJAL SHRESTHA ², AMIT KUNWAR 1.       OPTOMETRIST AND ORTHOKERATOLOGIST AT MATRIKA EYE CENTER 2.       OPTHALMOLOGIST AT MATRIKA EYE CENTER 3.       OPTOMETRIST AT MATRIKA EYE CENTER Cornea is the transparent part which covers the front portion of the eye. It covers the Pupil, Iris and Anterior Chamber of eye. The Cornea’s main function is to refract or bend the light. The Cornea is responsible for focusing most of the light that enters the eye. The Cornea is composed of proteins and cells. It does not contain blood vessels, unlike most of the tissue in the human body. Blood vessels may cloud the cornea, which may prevent it from refracting light properly and may adversely affect vision. The cornea is comprised of five layers: the epithelium, Bowman’s layer, the stroma, Descemet’s membrane, and the endothelium. The first layer, the epithelium, is a layer of cells covering the co