Rimless Frame Mount and Contact Lenses Addition

by Dragos
(Bucharest, Romania)

Q: Hi! I'd like to ask you a few questions on two different matters:

1. I have an uncut pair of -3.25 diopter Zeiss (PhotoFusion, Duravision Platinum coating) plastic lenses, 1.5 refractive index.

Can they be mounted on a rimless frame (taking in consideration that they are quite thick due to this diopter value)? Is it risky to assemble this kind of frames on the lenses I’ve mentioned, as they say that while drilling the holes for the plugs, the lens can crack?

2. How is the addition on the contact lens working? When is the low addition used and when is the high one used on a myopia contact lens, in relation to early or advanced presbyopia?

For instance, a +1 low addition makes the -3 diopter of the contact lens like a -2 diopter on that specific area of the lens, respectively a +2.5 high add. makes the same -3 diopter like a -0.5?

Thank you in advance for your answer,

Dragos

A: For the first question

As you know and see, the (-) lenses are thin in the middle and thick on the edge, and the thickness is diminishing from the edge to the center.

The rimless frame has screws that go through the lens, so there is a maximum thickness accepted for this kind of eyeglass. But the good news is that they will not mount the lenses on the edge where is the maximum depth.

The lens will be shaped and become smaller and thinner. So my advice is that you should choose a smaller frame, so the screws go in the glass in the thinner part and this way it should be ok.

For the second question

I'm not sure I understand the question correctly.

For example, if you mean a multifocal contact lens that has multiple diopters, then the lens has all the diopters without intersecting one with each other, so you have -3.00, then -2.75, -2.50. And so on from the center to the edge of the lens, and the addition is decided with an ophthalmologic consultation. This lens helps you see far and close.

If you mean that you have contact lenses for far vision, and want eyeglasses to put on with the contacts in your eyes, then you are right. The calculations are made the way you described, and you will have (+) diopter eyeglass that compensates your presbyopia so the total diopter will be the sum of the two diopters. Because one is (-) and one is (+), the total will be your close vision diopters.

Hope this helps
Arpi

Comments for Rimless Frame Mount and Contact Lenses Addition

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Feb 23, 2016

Contact lenses addition
by: Dragos

Thanks again for the answers.

Regarding the second question, I would like to specify that I was asking particularly about the multifocal contact lenses with addition. I wanted to add a picture of the label of the contact lenses I use now, but I'm afraid there is no upload possibility on "comments" field, so I don't know how to add it, in order to be more specific about the 2nd question.

Anyway, on the label it's written as it follows: "Multifocal, handling tinted soft contact lens; Power -3.25 MED (MAX ADD +2.00)". So, in this case, how is this add working on this particular contact lens? It means that it goes from -3.25 (on center) to -1.25 (on edge) with all the 0.25 steps in between as you mentioned, or it means something else? I'm asking all these things because I want to understand the principle of the multifocal contact lens. The optician who prescribed me these lenses didn't know how to explain me or didn't want to. And the main problem is that I'm not quite happy with the contact lenses mentioned above, as they don't really help me on reading or near-seeing. The thing is that when I don't wear the contact lenses (or the -3.25 diopter eyeglasses) with my naked eye I can read and see near objects perfectly, so i don't need yet near sight spectacles or correction. But with far sight glasses or contact lenses (even multifocal!) I don't read or see near things easily, as I used to a few years ago.

So, until I'll decide to get multifocal eyeglasses (because I'm sure that my eyes are still in transition to a deeper presbyopia), I tried to use multifocal contacts as a temporarily substitute, but unfortunately, they don't help me as much as I thought so.

Regards,
Dragos

Feb 25, 2016

Answer - Contact lenses addition
by: Arpi

Well, the thing is that the multifocal contact lenses are made standard with minimum and maximum addition and yes, as you said, the diopters is increasing from middle to the edge( in your case, because you have - diopters for far vision). So the close vision diopter is on the edge, and the far is in the middle as shown in this picture.

You can see it here.

They say maximum because there are several diopters between and you have a chance that one of those diopters is the right one for you, and you will see well. The thing is that if you have a 3.00 diopter addition, for example, you close vision diopter will be -0.50, so you will see well without this one ( is close to zero).

This multifocal lens is a real solution to your problem if you can get used to them and see clear far and close. If not, this means that maybe the multifocal eyeglass is a better idea, or you can wear far distance vision glasses, and for reading nothing.

As a technical thing, you can see here a picture with different types of multifocal contact lenses (check "Case 2") so you can understand the way they work. I explained you the concentric type, but as you can see, there are more types of multifocal contact lenses.

Maybe is just a question of choosing the right one.

P.S. If you want to upload a picture please add a new question on the FAQ page.

Feb 25, 2016

Thanks!
by: Dragos

Ok, I got it. Many thanks and really appreciate it! Regards,
Dragos

Mar 01, 2016

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