Difference between revisions of Trial lens kit

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= Trial frames =

Trial frames come in many forms, they may have lots of adjustments or come in fixed PD widths. Using a frame with the correct PD is important so the wearer is looking through the optical centers of the lenses. Adjust the frame for the best comfort and so the wearer is looking through the optical center of the lens. A trial frame that holds four lenses and has axis adjustment is best.

Trial frames are frames which you can mount trial lenses in and wear like glasses. They come in many forms, they may have lots of adjustments or come in fixed PD widths. Using a frame with the correct PD is important so the wearer is looking through the optical centers of the lenses. Adjust the frame for the best comfort and so the wearer is looking through the optical center of the lens. A trial frame that holds four lenses and has axis adjustment is best.

== Placing lenses in the trial frame ==

Always place the strongest lens in the stack closest to the eye to reduce the effects of [[vertex distance]].

Always place the strongest lens in the stack closest to the eye to reduce the effects of [[vertex distance]]. Line up the lines on [[cylinder]] lenses with the [[axis]] of [[astigmatism]]. There may be a dial that helps rotate the cylinder lens.

= Flippers =

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== JCC vs Stenopeaic ==

The use of a Stenopeaic slit vs a JCC lens seems to be cultural. Most US doctors will use JCC lens, while middle eastern doctors prefer the stenopeaic slit. Both tests work and it's more about how your doctor was trained which he/she will use. For DIY types, the stenopeaic slit is easy to make at home and is compatible with the simpler cm [[measurement]] when a full trial lens kit is not available.

The use of a Stenopeaic slit vs a JCC lens seems to be cultural. Most US doctors will use JCC lens, while middle eastern doctors prefer the stenopeaic slit. The stenopeaic slit may be more useful for very high astigmatism. Both tests work for low to moderate astigmatism and it's more about how your doctor was trained which he/she will use. For DIY types, the stenopeaic slit is easy to make at home and is compatible with the simpler cm [[measurement]] when a full trial lens kit is not available.

= Pinhole =

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 = Trial frames =
-Trial frames come in many forms, they may have lots of adjustments or come in fixed PD widths.  Using a frame with the correct PD is important so the wearer is looking through the optical centers of the lenses.  Adjust the frame for the best comfort and so the wearer is looking through the optical center of the lens.  A trial frame that holds four lenses and has axis adjustment is best.
+Trial frames are frames which you can mount trial lenses in and wear like glasses.  They come in many forms, they may have lots of adjustments or come in fixed PD widths.  Using a frame with the correct PD is important so the wearer is looking through the optical centers of the lenses.  Adjust the frame for the best comfort and so the wearer is looking through the optical center of the lens.  A trial frame that holds four lenses and has axis adjustment is best.
 == Placing lenses in the trial frame ==
-Always place the strongest lens in the stack closest to the eye to reduce the effects of [[vertex distance]].
+Always place the strongest lens in the stack closest to the eye to reduce the effects of [[vertex distance]].  Line up the lines on [[cylinder]] lenses with the [[axis]] of [[astigmatism]].  There may be a dial that helps rotate the cylinder lens.
 = Flippers =
@@ Line 39: / Line 39: @@
 == JCC vs Stenopeaic ==
-The use of a Stenopeaic slit vs a JCC lens seems to be cultural.  Most US doctors will use JCC lens, while middle eastern doctors prefer the stenopeaic slit.  Both tests work and it's more about how your doctor was trained which he/she will use.  For DIY types, the stenopeaic slit is easy to make at home and is compatible with the simpler cm [[measurement]] when a full trial lens kit is not available.
+The use of a Stenopeaic slit vs a JCC lens seems to be cultural.  Most US doctors will use JCC lens, while middle eastern doctors prefer the stenopeaic slit.  The stenopeaic slit may be more useful for very high astigmatism.  Both tests work for low to moderate astigmatism and it's more about how your doctor was trained which he/she will use.  For DIY types, the stenopeaic slit is easy to make at home and is compatible with the simpler cm [[measurement]] when a full trial lens kit is not available.
 = Pinhole =