Fitting criteria

OPTIVIZOR - Fitting criteria

First of all: Dogs' heads are so many and so different that each mask should actually be produced individually. Because that would be neither feasible nor affordable, Provizor has a different approach: There are three basic models (OPTIVIZOR for short, normal and long snout) and they are designed so that they can be adapted to the maximum. So please don't expect a mask to immediately have a perfect fit - this will only sometimes be the case. Here you will find a detailed description of the criteria by which an OPTIVIZOR can be assessed as suitable for the animal:

1. The OPTIVIZOR for long snout / for normal snout

Anis is a greyhound hybrid bitch whose owner has sent us a photo series of the perfectly fitting OPTIVIZOR. Thus Anis introduces us here to what one must pay attention to when fitting the OPTIVIZOR - in order to be able to judge whether the mask fits. A condition is always valid which one cannot see here: The OPTIVIZOR must sit tight, may not wobble or shuffle; otherwise it is too big!
Tip: Anis suffers from an unsettled itch in the whole face including eyes and snout. So in order to  prevent her from scratching, she waers the OPTIVIZOR; it may not be shortened in front in her case  because, otherwise, the snout would not be protected. But if it was only about the ocular protection, it may be cut off in front up to the most internal groove! 
a. DISTANCE HOLDER on the forehead: 
-The distance holder sits above the eyebrows (at most, however, middle of the forehead), - 
 - the coloured side stripes are below the eye level and also leave enough space under the ears.
- Quite ideally (however, not always accessible: The upper "edge" / curvature of the mask runs in parallel with the nasal back 
The coloured distance holder well nestles up against the forehead - it  neither leaves a hollow cavity under its curve (=mask is too small) nor does it stand out at the side (= mask is too big)

If the head is violently moved, the OPTIVIZOR does not slip off and does not slide onto the shoulders of dogs with long necks !
The chin strap is not supposed to sit tight - , but only ensures that the mask shuts well  around the face without restricting it. 
At the beginning and as long as the dog has got used to the OPTIVIZOR, the velcro fastening in the neck should be firmly closed: A finger may still fit in between, otherwise skilful dogs manage draw off the mask. If they have got used to it after mostly very short time, the cervical strap may be loosened again. The velcro fastening is adjustable to the millimetre.
e. EAR OPENING in front:
In front of  the ears the PVC leaves enough place, so that neither restricting pressure nor an aerial congestion can originate; this distance is also important for the air conditioning of the OPTIVIZOR.
The coloured collar of the mask needs to leave enough space between, behind and under the ears
As mentioned, not in Anis' case, but with dogs that need eye protection only: The mask can be shortened to leave the black nasal point free (see dotted line).



2. The OptiVizor for short snout 

In addition to the above criteria the following should be noted for dogs with short snout  Dog heads are so different - and this is especially true for breeds with short snouts. Therefore, we would like to show here, what to look for to be able to say: This OPTIVIZOR fits my dog  Joy, Charlie, Max and Leo will help us. 
Joy belongs to the new breed of mini pug. Unfortunately, she has already suffered an impact injury very early in life due to  her protruding eyes, which is why she needs the OPTIVIZOR eye protection. This size "mini" fits her very well: The mask is not wider than her head, the headrest is centered on the forehead between the eyes and ears. The nose opening leaves her enough spave to breathe and sniff, whereas the outer edge of the mask is "floating" before Joy's face. 
Here you can see now that the outer edge of the OPTIVIZOR almsot "floats" in front of Joy's face, so it has no nose bridge to rets on. The distance to Joy's eyes is wide enough so that the mask does not touch the wound. Joys ears have enough space in the opening provided and she can hear without problems.
Although Charlie has a small nose bridge, is the OPTIVIZOR fitting him (blue = medium-small size) does not touch his nose but floats aswell, ending right at his nose. This is what was intended, because Charlie has to keep his nose in the wind and thereby protect it from insects! 
(Charlie needed the OPTIVIZOR eye protection when he travels with his owner in an open buggy!) 
And now Leo: This gentle giant Mastiff  needs our very greatest OPTIVIZOR eye protection (also after an eye surgery). Leo uses the PVC nose piece . It rests on his nose bridge and provides some extra support for the mask. 
From the side you can see the nose bridge even better: It fits snuggly and keeps the mask in a stable position. Nothing wobbles. The wholes for the ears are large enough and at the same time ensures good ventilation. This OPTIVIZOR Eye protection is like a glove for Leo.
In this photo of Max taken from above you can see very well that the OPTIVIZOR leaves sufficient space in front of the forehead, so that the eyes are not touched by the mask. Also around the ears Max has enough space so that they can stand on and not be kinked.
And here the very important criteria are highlighted again: The OPTIVIZOR  for short snout only fits when the head is "not too deep", meaning the distance between the forehead and neck (as shown in this photo by the long arrow) is not too long. Because if this is the case, then the OPTIVIZOR will sit too close to the eyes and touch it (see below point 3 .: if the OptiVizor for short muzzle does not fit!). Here, the small red arrows indicate that the distance at Max is correct. The headrest sits on the middle of the forehead - as it should be
Although the nose piece rests well and the mask has enough distance from his eyes, Max did not like the nose piece - he would rather go without
So Max owner has done exactly the right thing: She has cut the nose piece off and also cut back the outer rim of the mask a little. So now there is more space around the nose and Max feels well again. 
... and again from the side: Max has plenty of room for his eyes. Also around the ears of the mask does not interfere as the cutout is large enough. 
Incidentally, the OPTIVIZOR for short muzzle are also quite suitable for dogs with normal snout - and especially if they have a lot of fur in their face. For this mask leaves more space around the eyes - so the coat is not pressed into the eyes! 

3. If the OPTIVIZOR for short snouts does not fit ..... 

If a dog with short snout (Pug, Bulldog, Boxer, etc.) has a very "deep" skull (= a large distance between the forehead and neck), then the OPTIVIZOR for short snouts often sits too close to the eyes. So it does not fit, because the mask must not touch the eyes. In that case, however, the OPTIVIZOR for NORMAL snouts can be used : 
These Bulldogs have "deep" heads, that is, the distance from forehead to neck is very long, as you can see well in this photo. If this is the case, the OPTIVIZOR does not fit the short snouted dog, because the mask then sits too close to the eyes. This is not only uncomfortable, but can make things worse.
In this case, the OPTIVIZOR for normal snout can help: The front needs to be cut quite heavily (see dotted line) and still protect the eyes reliably. But beware: Do NOT cut to the tip of the snout, because then there is too much space between the nose and the mask edge. The eyes would not be sufficiently protected when sniffing outdoors !