--%>
Assignment Help - homework help

Description of presbyopia and astigmatism

Give a brief description of presbyopia and astigmatism?

E

Expert

Verified

Presbyopia is visual impairment in which there is loss of cililary muscle strength thus reducing the ability of crystalline lens to adjust images of near objects on retina. In presbyopia the near point of vision becomes more distant. The disease generally takes place in old people.

Astigmatism is caused by the irregular shape of refractive structures, mainly cornea. In astigmatism a single object-point might create more than one image on retina and so the vision becomes distorted.

   Related Questions in Biology

  • Q : Simple squamous and stratified squamous

    How dissimilar is the simple squamous epithelium from stratified squamous epithelium? Where can such epithelia are found in human body?

    		•
  • Q : Functions of cartilages in the human

    Write some of functions of cartilages in the human body?

    		•
  • Q : What is Computer Integrated

    Computer Integrated Manufacturing (CIM): It is a combination of separate applications, like computer aided design (abbreviated as CAD), computer aided engineering (abbreviated as CAE), and computer aided manufacturing (abbreviated as CAM), robotics, a

    		•
  • Q : Classification of Birds Characterize

    Characterize the birds according to examples of representing beings, skin, basic morphology, respiration, circulation, nitrogen waste, types of reproduction and thermal control?

    		•
  • Q : Describe Network Administration Network

    Network Administration: It involves a broad array of operational tasks which help a network to run proficiently and smoothly. Devoid of network administration, it would be hard for all however the smallest networks to sustain network operations.

    		•
  • Q : What is Revenue Stream Revenue Stream :

    Revenue Stream: It is a term used to explain a form of income in a government or business setting. Any activity which produces income can be illustrated as a revenue stream, and it’s general for businesses to contain numerous streams of income.

    		•
  • Q : Explain Electronic Data Interchange or

    Electronic Data Interchange (EDI): The predecessor to electronic commerce, EDI has been appropriate only for big North American and European corporations and banks. Firms employing EDI are interconnected via a global computer network, independent of i

    		•
  • Q : Area of organizational change management

    What is the consequence of technology in shaping the area of organizational change management ?

    		•
  • Q : Structures of chloroplasts What are the

    What are the major structures of chloroplasts?

    		•
  • Q : Description of ancylostomiasis Give a

    Give a brief description of the term ancylostomiasis?

    		•