What is BVD on my Eye Sight Test?


This is my prescription:

Right eye has:

Sph -4.00
No Cyl or Axis

Left eye have:

Sph -3.50
Cyl -0.25
Axis 50.0

Which eye is the worse? By how much? What is Cyl and Axis, and why is that only affecting my Left Eye?

Also it say BVD = 12mm R+L

What does this mean?

Thanks =)

Answers:    Your right eye is worse. Your right eye have a spherical RX. Your left eye is almost as desperate, but has a cylinder Correction for astigmatism. Your BVD is the didstance for right and gone (R+L) that the refraction was done at away form your eye. this in recent times tells the being fitting your glasses that if your different glasses sit further or closer the Rx might own to be adjusted a bit. The further a lense sits from your eye, the likelihood of the Rx being idfferent increases, but I hold never really done this until someone reaches in the region of a -8.00 or so and most glasses do not sit that much different on most relations. But it is just for a time bit of info that they put on there. So, what is affecting your departed eye only? I am not sure what you are asking here. Have a in good spirits day!
Your right eye is worse but not by much, solely by -0.25. Cyl and Axis basically be determined that you have an astigmatism of -0.25 at 50 within that eye. Basically the angle of which the light enter your eye is altered by the shape of your eye. So your right eye is shaped like a football while your departed is like a rugby bubble. So the light will hold to be adjusted by 50 when entering your eye, so the lens on your prescription should alter this at 90+50=140. (Not to be adjectives technical on you)lol. Remember adjectives they are ever doing in optics is playing beside light via lenses to trademark the image crash down on the retina. But its absolutely conventional. Some people hold astigmatisms some dont and some, like you, simply in one eye. I do within both eyes. Im sorry im not sure what BVD stands for though! I THINK it may have something to do next to prisms in your eye. Sorry i couldnt assistance with that one.
Bilateral Vertex Distance (?). Judging by the 12mm reading, I'm assuming that's what it vehicle. Generally, the average pair of goggles sits 12mm from the corneal surface. Sometimes we will note the distance at which our instrument measured your reverie so that if you get a two of a kind of glasses that sits closer or farther from your eye than our instrument, the focal length can be used to to allow for the difference.

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