Optical Center:
I am getting let’s see if I’m able to remedy a number of the mysteries and make existence a touch bit simpler for you, One manner we’re going to do this is first to take a moment and learn certainly one of my preferred Optical Center champs. And it’s far this the shorter the radius the steeper the curve the better the strength the thicker the lens. It’ll by no means permit you to down and come to be specifically helpful in case you get into touch lenses. So allows an overview of that one greater time. The shorter the radius the steeper the curve is steeper the curve.
Optical center Lens:
The better the energy the thicker the lens Optical center is positioned up there and ensures you keep it. There if I took these numbers and I pushed you a little bit I said what is five what is that? What’s that seven you can provide you with all kinds of answers you could say electricity they say sphere? They are saying cylinder they say diopter you’d be right on all the one’s matters type. Of what the ones are curves at the lens the energy that we get from a lens comes?
Optical center pass:
From the curves that floor onto it, the one’s curves are what we’re looking to draw on an optical cross. And the motive that receives a little difficulty is the Optical middle pass. Is flat it’s one-dimensional and the curl is about energy now not approximately prescription. We’ll speak approximately that after we get to the whiteboard however for now. Understand that we’re searching at the 2 important powers through the lens. Which could usually do flat transposition and,
Whiteboard:
We’re talking approximately the 2 foremost meridians which can be 90 levels apart from each different. And that’s all worried about whilst we’re talking approximately the impediment cross so let’s take a near look. At this lens and notice if we can’t help you visualize. What it’s the miles that we do whilst we head to the whiteboard and begin seeking to draw out throughout the Optical center? Now allows take an actual close to observe the lens and see if i will assist you to visualize the,
Transposition of Lens
Those matters that we mentioned I’ve taken this lens and I’ve divided it into bands a green band. In a red band for the sake of this challenge at Optical middle, we’re going to say. That this lens is a minus five minus 2 and we’re going to position an axis of forty-five on it. However, that’s no longer going to be important till a little bit later whilst. We hit the whiteboard if I deal with a transposition. I might have a minus 7 plus 2 at one hundred thirty-five if I take this lens and I observe my pink band, in this situation, my purple
Lens effective point
The band would constitute my minus 7 it’d be the maximum effective factor on the lens. Everywhere it’d have my thickest facet it would have my steepest curve and that curve could have a tool Optical middle. Whilst the lens with a very quick wave 90 levels far from my crimson I had my green band. In this case, my green band would constitute my minus 5 it might represent the thinnest factor. In this one, it would constitute the shallowest curve everywhere on this lens.
Black Mark
And that would have by using a device with an extended radius than my 7 the little black mark. Which you see is a sign that those two points are 90 degrees far from every different and you’ll see that in some other places. This is why I put that on there among my crimson and my inexperienced lens. Will usually be going from 7 right down to five or from five up to 7 in power. All of the points here have extraordinary powers and we’ll learn how to calculate.
