--%>
Assignment Help - homework help

Explain presbyopia and astigmatism

Explain presbyopia and astigmatism?

E

Expert

Verified

Presbyopia refers to the visual impairment where there occurs loss of cililary muscle strength hence, decreasing the capability of crystalline lens in order to adjust the images of nearby objects onto the retina. In presbyopia, the near point of the vision becomes more distant. The disease normally takes place in the old people. Astigmatism is caused due to irregular shape of refractive structures, specially the cornea. In astigmatism, a single object-point can generate more than one image onto the retina and therefore the vision becomes distorted.

   Related Questions in Biology

  • Q : Bioremediation in bioremediation

    in bioremediation Gibberella fusarium is used to break down

    		•
  • Q : Characterization of birds-according to

    How the birds are characterized according to circulatory system?

    		•
  • Q : How is the sound vibration captured by

    How is the sound vibration captured by tympanum transmitted through ossicular chain of middle ear?

    		•
  • Q : Organelle of cell structure On what

    On what organelle of cell structure does intracellular digestion based? What is the chemical content of such organelles?

    		•
  • Q : Define Team Building Team Building : It

    Team Building: It is a procedure which develops cooperation and teamwork in a work unit. To comprise an efficient team, its members should share a common goal, encompass respect for each other, and be provoked to use the strengths of each member to at

    		•
  • Q : Ecological interaction competition

    Describe briefly about the term competition? Which kind of ecological interaction is competition?

    		•
  • Q : What is Direct Response Marketing

    Direct Response Marketing: It is a form of marketing that elicits an exact, measured response resulting from direct response to a marketer of a consumer. Direct response marketing assists the delivery of a call to action and outcome through direct or

    		•
  • Q : What is Frame Relay Frame Relay :

    Frame Relay: Telecommunications technology which breaks data stream into small data packets termed as frames, to give transmission speeds of 64 kilo bits per thousand (Kbps) to 2.4 giga bits per second (Gbps) at fairly lower costs. The Frame-relay equ

    		•
  • Q : Cuboidal epithelium from columnar

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

    		•
  • Q : Type I and type II diabetes mellitus

    Specify some of the difference between type I diabetes mellitus and type II diabetes mellitus?

    		•