Type of transposition// कैसे करते है? कितने प्रकार के होते है? // Transposition//Mohd. Ameen//

Transposition in optometry is a calculation to change the power prescription from one form to another form while maintaining the same meridian values in both forms. It is simply converting the eyeglass prescription (Rx) from one form to another so as to maintain the same meridian values in both forms. There are two types of transposition: simple transposition and toric transposition
Transposing a Rx prescription is simply converting the prescription from minus cylinder notation to plus cylinder notation. The optical properties of the prescription remain the same.
Procedure:
1) Add the cylinder power to the sphere power to arrive at the new sphere power.
2) Change the sign of the cylinder power.
3) Add or subtract 90 from the axis.
Example 1- Transpose the following prescription:
+2.00 - 2.50 x 105
1) +2.00 - 2.50 = - .50 (new sphere)
2) -2.50 changes to +2.50 (new cyl.)
3) 105 - 90 = 15 (new axis) * your axis transposition can never be greater than 180
Answer: -.50 +2.50 x 15
Example 2 -
+1.00 + 3.00 x 35
1) +1.00 + 3.00 = +4.00
2) +3.00 changes to - 3.00
3) 35 + 90 = 125
Answer: +4.00 - 3.00 x 125
Why are there plus and minus cylinders? Plus cylinder lenses exist only in phoropters and trial lenses. Plus cylinder phoropters are popular because it is easier to teach retinoscopy in a plus cylinder. Ophthalmologists typically learn retinoscopy and refraction in plus cylinder. Optometrists typically use minus cylinder.
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/ optomguru

[@Fishinguniverse7]

Why you are putting simple compound to cross compound??

[@OptomGuru]

Brother this video is only for optometrists purpose.

[@Mishritvichar]

Sign ko kyon change karna hai yah bhi to Bata kar jaaiye.

[@OptomGuru]

bhai ye video only optom ke liye h..full details video chahiye to new video bana dunga

[@OptomTribhuvan]

Background music 😢

[@OptomGuru]

kya hua mere bhai

[@OptomTribhuvan]

Kuchh nhi sir background music thoda slow hoga to jada achha sir ji

[@Fishinguniverse7]

Why you are putting simple compound number to cross compound ???