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Q. (a) What is astigmatism? How is it caused? How can it be corrected?(b) A person is unable to see both far as well as near objects. What is the defect he is suffering from? What could be the reason for this defect? What type of spectacles should be worn by him to correct his vision......????? |
| Answer» <html><body><p><img align="absmiddle" alt="\huge \red {\underline {HAYE\:MATE}}" class="latex-formula" id="TexFormula1" src="https://tex.z-dn.net/?f=%20%5Chuge%20%5Cred%20%7B%5Cunderline%20%7BHAYE%5C%3AMATE%7D%7D%20%20%20" title="\huge \red {\underline {HAYE\:MATE}}"/></p><p></p><p> <img align="absmiddle" alt="\huge \red {\mathbb {ANSWER}}" class="latex-formula" id="TexFormula2" src="https://tex.z-dn.net/?f=%20%5Chuge%20%5Cred%20%7B%5Cmathbb%20%7BANSWER%7D%7D%20%20" title="\huge \red {\mathbb {ANSWER}}"/></p><p></p><h2><strong><em><u>(a) </u></em></strong><strong><em><u>Astigmatism</u></em></strong><strong><em><u> </u></em></strong>:</h2><p></p><p> <em>The defect by which the person is not able to differentiate horizontal and <a href="https://interviewquestions.tuteehub.com/tag/vertical-726181" style="font-weight:bold;" target="_blank" title="Click to know more about VERTICAL">VERTICAL</a> position, is called astigmatism.</em></p><p></p><h3><strong><em><u>Causes of Astigmatism</u></em></strong>:</h3><p></p><ul><li><em>Astigmatism is <a href="https://interviewquestions.tuteehub.com/tag/caused-7279664" style="font-weight:bold;" target="_blank" title="Click to know more about CAUSED">CAUSED</a> by an unevenly shaped cornea. </em></li><li><em>The uneven shape causes the rays of light to focus on two points on the retina, causing distortion and <a href="https://interviewquestions.tuteehub.com/tag/blurring-900040" style="font-weight:bold;" target="_blank" title="Click to know more about BLURRING">BLURRING</a> of images.</em></li></ul><p></p><h3><strong><em><u>Correction of astigmatism:</u></em></strong></h3><p></p><p><em><u>This defect of vision can be rectified by using cylindrical lenses</u></em>. </p><p></p><h2><em><u>(b)presbyopia</u></em></h2><p></p><p> <em><u>The defect of eye in which a person is <a href="https://interviewquestions.tuteehub.com/tag/unable-2316683" style="font-weight:bold;" target="_blank" title="Click to know more about UNABLE">UNABLE</a> to see both far as well as near objects clearly is called presbyopia</u></em>.</p><p></p><h3><strong><em><u>Causes of presbyopia:</u></em></strong></h3><p></p><p><em><u>This defect of vision commonly occurs to old people because of the following reasons:</u></em></p><p></p><p></p><p><strong><em><u>Weakening of the ciliary musclesReduction in the flexibility of the eye lensCorrection of presbyopia:</u></em></strong></p><p></p><ul><li><em><u>This type of defect can be corrected by using spectacles having bi-focal lenses in which upper part consists of a concave lens to correct myopia (shortsightedness) used for distant <a href="https://interviewquestions.tuteehub.com/tag/visions-1447177" style="font-weight:bold;" target="_blank" title="Click to know more about VISIONS">VISIONS</a> and the lower part consists of a convex lens to correct hypermetropia (long sightedness) sused for reading purposes.</u></em></li></ul><p></p><p></p><p></p><p></p><p></p><p></p><p><img align="absmiddle" alt="\huge \blue {\mathbb {THANKS}}" class="latex-formula" id="TexFormula3" src="https://tex.z-dn.net/?f=%20%5Chuge%20%5Cblue%20%7B%5Cmathbb%20%7BTHANKS%7D%7D%20%20" title="\huge \blue {\mathbb {THANKS}}"/></p><p></p><p></p><p></p><p></p><p> </p><p></p><p></p><p> <img align="absmiddle" alt="\huge \green {FOllOW\:ME}" class="latex-formula" id="TexFormula4" src="https://tex.z-dn.net/?f=%20%5Chuge%20%5Cgreen%20%7BFOllOW%5C%3AME%7D%20%20%20%20" title="\huge \green {FOllOW\:ME}"/></p><p></p><p></p><p></p><p><img align="absmiddle" alt="\huge \purple {\mathbb {SINGLE\:STAR}}" class="latex-formula" id="TexFormula5" src="https://tex.z-dn.net/?f=%20%5Chuge%20%5Cpurple%20%7B%5Cmathbb%20%7BSINGLE%5C%3ASTAR%7D%7D%20%20" title="\huge \purple {\mathbb {SINGLE\:STAR}}"/></p></body></html> | |