Convert from Spectacle RX to Contact Lens RX

[plumber007]

I want to convert the following from spectacles RX to contact RX.
OD:- Sphere -2.75 Cylinder -3.00 Axis 7
OS:- Sphere -5.00 Cylinder -1.00 Axis 172

Is it ok to assume 172 as 170 and 7 as 10? Also I am confused if I should deduct 0.5 or 0.25 from -5. What would be the lens prescription? Thanks in advance

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[Commando303]

I'd probably start with,

pl-2.00X180
pl-4.00X180

That said, the left eye has more cyl. than any non-custom soft toric contact lens of which I know can correct. I thus may consider a rigid lens — at least for the left eye — instead.

 

[KHE]

I think you misread the question. the response you gave is not matching up.

 

[KHE]

I want to convert the following from spectacles RX to contact RX.
OD:- Sphere -2.75 Cylinder -3.00 Axis 7
OS:- Sphere -5.00 Cylinder -1.00 Axis 172

Is it ok to assume 172 as 170 and 7 as 10? Also I am confused if I should deduct 0.5 or 0.25 from -5. What would be the lens prescription? Thanks in advance

Approximatly -2.75 - 2.50 axis 7 for the right eye and -4.75 -0.75 axis 172 in the left.

 

[Commando303]

I think you misread the question. the response you gave is not matching up.

Whoops. I read the beginning of the prescription, and thought the poster wrote "sphere" in place of "plano," by accident.

 

[blazenmadison]

Sounds like someone is trying to order contact lenses without an contact lens prescription

 

[mathcod]

[If you are asking if those 2 degrees are important on the axis, the answer is yes! I'll explain why degrees are so important:

At 211 degrees, water is hot. At 212 degrees, it boils. And with boiling water, comes steam. And with steam, you can power a train. #EveryDegreeMatters

 

[Commando303]

[If you are asking if those 2 degrees are important on the axis, the answer is yes! I'll explain why degrees are so important:

At 211 degrees, water is hot. At 212 degrees, it boils. And with boiling water, comes steam. And with steam, you can power a train. #EveryDegreeMatters

 

[plumber007]

Approximatly -2.75 - 2.50 axis 7 for the right eye and -4.75 -0.75 axis 172 in the left.

Yeah, but axis 7 for the right eye can be assumed as 180 and so can the left one. But yeah you are right. Thanks