Re: Pupillary distance

On Wed, 19 Jul 2006 14:05:46 +0000 (UTC), Tony Houghton
<this.address.is.fake@xxxxxxxxxxx> wrote:

In <44be355c$0$72148$c30e37c6@xxxxxxxxxxxxxxxxxxxxxxxxxxx>,
Dom <dont@xxxxxxx> wrote:

Tony Houghton wrote:
My optician has given me two PD figures: 66 distance and 63 near. I tend
to spend more time reading and using a computer than driving and outdoor
activities. For single vision lenses, which figure would it be better to
use, or should I compromise somewhere in between?


Are you short sighted (minus prescription) or long sighted (plus
prescription)?

R: Sph -6.25 Cyl -0.75 Axis 15
L: Sph -6.50 Cyl -0.50 Axis 42.5

Your dispensing optician should determine the monocular interpupillary distance.
The numbers should look like- 35/31, 33/33, or 32/34, in other words each eye
individually. Very important for complex lens designs (aspherics, atorics, PALs)
and for stronger powers.

I would usually use the distance IPD for both distance and readers, allowing the
principal axis to pass through the center of rotation of the eye.

Hope this helps,



Robert Martellaro
~~~~~~~~~~~~~~~~~~
Optician/Owner
Roberts Optical
~~~~~~~~~~~~~~~~~~
"If a million people believe a foolish thing, it is still a foolish thing."
- Anatole France
.

Relevant Pages

  • Re: Infinite 3d lattice
    ... distance from the nth face (measured along the x axis) to a point at x ... So the force from the nth face on x is going to ... So F is a cyclic function with period 1. ...
    (sci.math)
  • Re: Semi-minor Axis
    ... the perihelion and aphelion distance. ... more than half the length of the "minor axis" itself because the Sun is not ... > Sun and Perihelion was the semi-minor axis. ...
    (uk.sci.astronomy)
  • Re: Biofinity--Spheric or Aspheric? Does asphericity provide a slight presbyopia correctio
    ... distance and near. ... That's the importance of the "spherical equivalent" principle; ... If not, -125 cyl ... toric lens in the distance eye, could negatively affect near vision, in a ...
    (sci.med.vision)
  • Re: Astigmatism vs. distance
    ... assume common practice is to prescribe for distance and take what you ... like it would be simple enought to change cylinder power for close. ... reduced cylinder to my distance glasses (I can't see distance with the ... There is something called meridional accommodation which theoretically can mean a different cyl measurement for near than for distance. ...
    (sci.med.vision)
  • Re: New challenge to Einstein from experiment?
    ... Just use odometer (distance), ... Th drawing above is a graph of the distance on the ... horizontal axis versus time on the vertical axis. ... >> would stretch along the energy axis to the point ...
    (sci.astro)
Loading