I've always had this rule I follow and I can't remember who passed it on or where I read up on it: when dispensing, to always match the refractive index for both eyes, irrespective of the Rx.
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I've always had this rule I follow and I can't remember who passed it on or where I read up on it: when dispensing, to always match the refractive index for both eyes, irrespective of the Rx.
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Hoya iD and Hoya Trinity are not the same lenses.
Hoya Trinity incorporates Hoya iD lens design concepts (double sided integrated digital surface, variable near inset (or nominated inset values...
Hi all,
Australian convention for Hoya's premium multicoat "Super High Vision" is "Super Final Touch" (i.e., "SFT") coating! Which shares the same Hoya recommendations for cutting a VP multicoat....
I would speak to your lens caster. They will have their own recommendations for their own materials in regards to minimum edge thickness for all frame types!
For an example, Hoya recommend:
...
Dear Leyend,
I can say that the Hoya ID and FD are currently not available to correct for vertical prism imbalances by the way of the 'slab-off' method at this time.
However, Hoya GP, Summit...
Hey Leyend,
As far as vertical prism imbalances:
I do not know whether the ID or FD automatically corrects this, or even the instructions to do so.
I will have to get back to you about this...
Hi Leyend,
To answer some of your questions,
XF is the Front surface addition power
XB is the Back surface addition power
XW is the Addition power for the as-worn position
...
I find the main problems with chrome is its compatability with some java and flash websites, i.e., some java buttons disappear all together (like a webmail 'send' button - so i couldn't send email!),...
just before you purchase a new one, you can try one last thing..
the manufacturer might have released a new firmware for your model router, which they do from time to time, which might fix your...
LOL Chip!
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A manager I observed a while back gave a customer (who was collecting specs with AR) spec spray and a microfibre cloth and said,
"now don't use the cloth, it...
"Tech Brief on Optical Optimization" by Darryl Meister, ABOM
For those people who missed out on, or couldn't get their hands on 20/20 USA October (like myself and a few others across the...
For the power at meridian formula, try inputting the calculation with brackets.. ie..
enter:
minus, 1, decimal, 7, 5 ( -1.75 )
open bracket, open bracket ( (( )
sin, 4, 5, close...
the 2 after r1 and y etc in the sag formulas should be superscript (ie 'squared')
F135 = Fcyl sin2 θ + Fsph
= -1.75 (sin2 45) + -3.75
F135 = -4.625D
F = F1 + F2
F2 = F – F1
= -4.625 - +4.00
F2 = -8.625D
r1 = (n – 1)1000
Oh absolutely! And I never knew until I got these lenses a few months ago. It took me about a week of pondering and self realization to figure it out..
(..that I'm "one of those" customers which...
My current 'work' pair is trivex (with VP), it is the clearest vision I've ever had!
My first pair was eyas, then a few 1.74s and now trivex - but man it's thick!
I'm a -1.75 with 0.25 cyls,...
Ecliptic,
If you were deciding between hoya 1.7 or essilor 1.74, I would speak to each rep and get yourself both pairs at no charge, I'm sure they would be happy to oblige as they know they will...
I'd want a set of Rx specs that could change instantly from clear AR state to 65% polarised and then 85% on demand (maybe a button near the RHS closing block which could toggle/cycle through states)....
In Australia, optometrists recommend a full comprehensive examination every two years, depending on age, risk factors, and physical condition and could be as regular as 6 to 12 months.
...
I've put it down to the general public's lack of awareness/education related to their eyes and clinical optometry. i.e., what other reasons we're here for.
You get the ones who come in only when...
I imagine you would have amazing thoughts and ideas in your head, have you considered putting them on paper?
It doesn't have to be perfect intially, however a business plan is essential, as it...
Begin by working out the vertical (v) and horizontal (h) components of prism in each eye, presenting them side by side helps (however the nature of this post i have to just do one eye after another....
The wearer will not experience any differential prism as his/her eyes are in balance.