Polarization Method - Polarized Targets and Polarizing Filters (Binocular Subjective Refraction) 3/4

Описание: Polarization:
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-- Light is a electromagnetic wave which vibrates multiple plane when pass through a medium, this called unpolarized light
-- The process of transforming unpolarized light into polarized light is called polarization.
-- In Polarized light waves, light vibrates in single plane

What is polarized letter or chart?
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-- polarized chart is chart in which polarized letter are used in normal background.
-- Means polarized letters reflected their light rays in only one direction
-- If we use a Filter or Analiser, they block the polarized light rays and only white background is seen by the patient

Polarization Method:
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• Polarized letters are used in normal background
• An Analyzer is used in front of eye which allow right eye to view right half of the target , but blocking left half of target from view and left eye to view left half of the target , but blocking right half of target from view.
• Example:
Polarized Targets and Polarizing Filters
Vectographic Slides for Projection

Polarized Targets and Polarizing Filters:
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• Simplified binocular subjective refraction
• Proper positioning of septum not necessary
• Distance acuity chart divided into two halves, each covered by polarizing films

Procedure:
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 Patient sit comfortably and directed towards the chart
 Analyzer place before the starting Point
 Best Vision Sphere: Start with retinoscopic findings (Starting point) and determination made until approximately 6/6 letters are clear.
 Jackson Cross Cylinder: To determine presence , amount and orientation of astigmatism.
 Fogging: Blur or fog the characters to approx. 20/40 level by adding 0.75 or 1.00 sphere (more plus or less minus to the sphere power)
 From this point power is decreased in 0.25 steps until best or maximum visual acuity is attained.
 End point may be monitored by red green balance (duochrome test) to avoid over minusing
 Same procedure repeated for left eye
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Binocular Subjective Refraction:
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Part-2:    • Septum Method - Turville Infinity Binocula...  

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