--%>
Assignment Help - homework help

Define the terms astigmatism and presbyopia

Define the terms astigmatism and presbyopia?

E

Expert

Verified

Presbyopia is the visual impairment in which there is a loss of cililary muscle strength therefore dropping the capability of crystalline lens to adjust images of close objects onto the retina. In presbyopia, the near point of vision becomes more far-away. The disease usually takes place in old people. Astigmatism is caused by the irregular shape of refractive structures, mostly the cornea. In astigmatism, a single object-point might generate more than one image onto the retina and therefore the vision becomes distorted.

   Related Questions in Biology

  • Q : Competitive barriers of industry to

    Competitive barriers of industry to overcome:1. Advertising Since our product is slightly different product, products from existing or potential competitors cannot be fully substituted in place of the strong playe

    		•
  • Q : Define somites Define somites briefly?

    Define somites briefly?

    		•
  • Q : Similar species with reproduction

    Can two normal individuals of similar species with sexual reproduction contain similar genomes and similar karyotypes? How the human karyotype is generally symbolized?

    		•
  • Q : State Office Automation or OA Office

    Office Automation (OA): The utilizations of computer systems to execute a diversity of office operations, like accounting, word processing, and e-mail. Office automation nearly always implies a network of computers with a diversity of accessible progr

    		•
  • Q : Elements which form middle ear Write

    Write down the elements which form middle ear? And also write down the names of the three middle ear ossicles which participate in phonosensitivity?

    		•
  • Q : Main theoretical models-Formation of

    What are the main theoretical models that try to explain the formation of the enzyme-substrate complex?

    		•
  • Q : How chordates are reproduced Explain,

    Explain, how chordates are reproduced?

    		•
  • Q : BUREAUCRATIC MANAGEMENT BUREAUCRATIC

    BUREAUCRATIC MANAGEMENT                                               &

    		•
  • Q : Classes into which mammals are

    What are the three major classes into which mammals are classified?

    		•
  • Q : Explain Marketing Strategy Marketing

    Marketing Strategy: It is a model or process to permit a company or organization to focus restricted resources on the best opportunities to enhance sales and thereby attain a sustainable competitive advantage. It is a process which can permit an organ

    		•