--%>

Hypermetropia and myopia

Optically explain, the visual deficiencies known as hypermetropia and myopia?

E

Expert

Verified

Myopia refers to the visual condition where the images are formed before the retina. Hypermetropia refers to the visual condition where the point of image formation is beyond the retina. Myopia is caused with an increase in the distance between retina and crystalline lens, majorly, caused due to slight flattening of eyeball. In hypermetropia, the retina appears to be too close to the crystalline lens because of slight shortening of eyeball. In myopia, the near and far point of  the vision come closer (the refractivity of crystalline lens which corresponds to maximum distension capacity of ciliary muscles is not sufficient in order to provide the visual accommodation). In hypermetropia, the ciliary muscles are not able to contract more in order to compensate the inadequate position of the retina, that is, near point becomes more distant.

   Related Questions in Biology

  • Q : What benefit does a pathologist have

    What benefit does a pathologist have over investigators in most other fields in data-mining studies or carrying out outcomes?

  • Q : Circulatory system of birds Explain the

    Explain the circulatory system of birds?

  • Q : Problem relating to allowance The 2010

    The 2010 annual report of Willamette Valley Vineyards, Inc., comprised the following information associating to their allowance for doubtful accounts: Balance in allowance at the starting of the year $54,330, accounts written off throughout the year $51,467, balance i

  • Q : How is gingivitis cured How is

    How is gingivitis cured?

  • Q : Comarison of tubular-dorsal nervous

    How tubular-dorsal nervous system in chordates is compared to nervous pattern which is present in invertebrates?

  • Q : Conflict - Organizational Behavior

    Meaning and definition The concept of conflict, being an outcome of behaviors, is an integral part of human life. Wherever there is interaction, there is conflict. Conflict can be defined in many ways and can be considered as an expression of hostility, negative attitudes

  • Q : Special structures of the avian

    Describe the special structures of the avian digestive tube and their relevant functions?

  • Q : Enzymatic reaction-Effect of a substance

    In support of enzymatic reaction write down the effect of a substance with same spatial conformation as enzymatic substrate? How is this kind of substance recognized?

  • Q : Explanation of cytochromes Give a brief

    Give a brief explanation of cytochromes.

  • Q : Analyze the politicians effect on

    The rash of hurricanes which pelted the Gulf Coast in the year of 2005 resulted in a large decline in gasoline production as several offshore rigs were shut down and several refineries were taken off line whereas waiting out the hurricane. The decrease in supp