Thickness of the Lenses

1.5 Standard Organic Lenses

The standard organic lens called CR-39 of 1.5 refraction index are the normal lens, light and resistant to bangs or blows. It is recommended for low prescriptions, as in high or medium prescriptions you might notice the thickness of the edge of your lens.

We recommend it for low prescriptions up to +/- 2.00 Dp.

It is not suitable for rimless glasses as they might brake due to the teller’s pressure produced.

1.6 Reduced Organic Lens

The organic lens of 1.6 refraction index can be up to 15 to 20% more slimmer than the standard. It is also lighter and more resistant to blows. They are more esthetic lens for medium prescriptions.

We recommend, for medium prescriptions +/- 2.00 Dp a +/- 4.00 Dp.

It accepts Rimless Frame (Montura al aire)

STANDARD ORGANIC LENSES

The organic lenses are made of CR-39 of maximum quality. They are light and very resistant to blows. We recommend to clean it while humid and you should dry it with the lenses’ cloth that we’ll send you or with a very soft cloth to avoid scratches.

ANTI-GLARE ORGANIC LENSES

It is a treatment that takes away all the reflections produced by artificial lights (screens, lamps, pcs, car lights…). It is on both sides of the lens so it erases all reflections both in front and rear. It has a transmittance that lets the light pass on to a 99,2% of the lens. They give you more visual comfort, so that you won’t get tired so easily when you are on the computer screen, studying, in the office, etc… They are more aesthetic given that your eyes will be more seen than the reflections. It comes with a STRONG AND HARDENED treatment so that it won’t scratch so easily and they will also be easier to clean than the standard ones.

EASY CLEANING & NATURAL ANTI-GLARE ORGANIC LENS

Apart from the anti-glare and the hardened effect, it has a treatment that repels dust and water, so it won’t get dirty that easily and even more, they are easier to clean.

The contact angle of water and dirt with a covered area of anti-glare of easy cleaning, is better with normal lens, ie, it leans less on the surface, making it more difficult for dirt to stay on it, and if it stays after all, it is easier to remove from there, as it has little grip.

Blue Light Eye Protection

This treatment in addition to the benefits of the easy to clean anti-reflecting lenses, has a filter that protects against radiation producing electronic devices such as computer screens, tablets and mobile phones, the so-called "blue light". This type of light produces a visual fatigue, a feeling of tiredness in the eyes when roast many hours ahead of such devices. Also is harmful to them eyes tissues because its toxicity is accumulates. Blue Light Eye Protection, in addition to filter the light, also blocks infrared radiation, which facilitates the formation of wrinkles on the skin and a factor for the onset of cataracts. 

POLARIZED TREATMENT

 This is a treatment that applies to sunglasses lenses in order to eliminate part of the solar glare reflected on certain surfaces such as water, snow, sand or asphalt. It has the same protection against UV rays, but also eliminates annoying reflections getting a more comfortable vision without glare produced by natural light.

Colorations

NONE

The lenses are transparent without any kind of color.

COLOR: Gray, Green and Brown.

They are the tinted lenses that are used to graduate sunglasses. They have an absorption percentage of 85%, ie, 85% of the visible light of the sun will no trespass the lens. They are ideal for sunglasses. They have an UV filter that avoids 100% of the ultraviolet rays that come down to the surface.

You can’t drive with these lenses at night.

Colors are:

.    Gray: It alters other colors smoothly. Ideal for irregular light atmospheres.

.    Brown: It alters other colors smoothly. Ideal for outside sports.

.    Green: It alters colors a lot. Ideal for nautical sports and snow.

Photochromic

The photochromic lenses are those that vary their color grade depending on the luminosity intensity. Therefore in a very sunny day, they become dark (absorbing an 85% of luminosity) and when it comes to an interior room or at night, they become practically transparent (between a 6 to 7% of transmittance).

Photochromic cells are activated by ultraviolet light, so they are quickly activated on the street, almost as sunglasses, and when you walk inside a room, they rinse as a regular graduated lens.

Prescription or Ophtalmological Recipe

It is very easy to get to know your prescription with a recipe. Normally, if you go to the optic or the ophtalmologist he will give you your prescription in a paper that we call Optical Prescription or recipe.

On the recipe, you will firstly see your right eye prescription and then normally, the left eyes.

Farsightedness 

On the recipe it will appear as far, far seeing, for every use, VL, Sphere, SPh. It indicates us the prescriptions sphere that you need, it can be of myopia so it will be preceded by a "-" symbol (example:-2.00 esf, -2.00 Dp) or it can also be farsightedness so it will come with a "+" symbol (ej: +2.00 esf, +2.00 Dp) or without a symbol at all (example: 2.00). This long sight value or far sight sphere is a number followed by two decimal numbers, that add up from 0,25 to 0,25 as this example (-1.00,-1.25, -1.50, -1.75, -2.00).

Astigmatism / Cylinder

If you have astigmatism, it will appear as CIL, Cylinder on the recipe, and then eje, axis. This astigmatism is always associated to an axis, therefore there will always appear a number with a sign like "+"or "-" with two decimal numbers next to the axis, that will be a number between 0º and 180º (it normally goes from 5 to 5) (ej: +2.00 cil to 90º, or -2.00 cil to 180º). On the recipe, a circle or a semi circle might also appear, where the professional optic must indicate the axis with a line that goes from the centre of the circle to the axis value.                                                          

Addition

near, for near, esf cerca, VP. We must add this value or header if you want to make a progressive lens or for only reading glasses.

In order to put the necessary close or near prescription to a progressive, we must know which is the Addition (Add). This value indicates us the power that we must add to your far sphere so that you are able to see well in close distances. It is a positive value "+" and worth usually fluctuates between +0,75 and +3.00Dp, increasing 0,25 each time depending on the age. If it comes as Add, we will insert it on the Addition header for the progressive prescription. If it comes as Near or Close Vision or VP Near we must calculate it´s, as follows. To calculate your addition we must deduct (take off) the long distance prescription from the close or near distance one.

If you have farsightedness we must deduct from the near sight prescription as follows:

 (VC +3.00) - ( VL+1.00), Add Addition will be +2.00 (3-1)

If you have myopia we must do an algebraic subtraction, counting with the symbols "+" and "-".

 (VC +2.00) - (VL -1.00)  Add Addition will be +3.00 (+2.00 +1.00)

(VC -3.00) - (VP-5.00) Add Addition will be +2.00 (-3.00 + 5.00).

It´s easy, we only need to know the difference between close and far distance prescriptions.

Inter Pupillary Distance

Put a rigid rule to the height of the eyebrows. The ruler must be straight, parallel to your eyes, not tilted.

And you're done, send the photo to info@opticathome.com giving us your order number and we will mount the glasses with the correct pupillary distance.