In each brand (Hoya Vision, Hoya One Vision, Sensity Lenses, Seiko Vision and Pentax Optical) the Google Analytics ID and Google Tag Manager ID are located in the Settings page under the Google/Tracking tab:

N.B. These IDs are changeable per language (CultureSpecific).
These ids are used to rendered, in the source code of the page, the respectively scripts: Google Analitytics script and Google Tag Manager script / Google Tag Manager noscript .
The Google Analitytics script will not be rendered in the source code of the page:
The script generated is located in the top body of the source page:
<script>
(function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
(i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
})(window,document,'script','https://www.google-analytics.com/analytics.js','ga');
ga('create', 'UA-18012688-38', 'auto');
ga('send', 'pageview');
</script>
The Google Tag Manager scripts will alway be rendered in the source code of the page even if this id is left empty, in this case the following default ids will be used per brand:
The first script generated is located in the top head of the source page:
<!-- Google Tag Manager -->
<script>
(function (w, d, s, l, i) {
w[l] = w[l] || []; w[l].push({ 'gtm.start': new Date().getTime(), event: 'gtm.js' });
var f = d.getElementsByTagName(s)[0],
j = d.createElement(s),
dl = l != 'dataLayer' ? '&l=' + l : '';
j.async = true;
j.src = 'https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);
})(window, document, 'script', 'dataLayer', 'GTM-W3VRWHS');
</script>
<!-- End Google Tag Manager →
The second script generated is located in the top body of the source page:
<!-- Google Tag Manager (noscript) -->
<noscript>
<iframe src="https://www.googletagmanager.com/ns.html?id=GTM-W3VRWHS" height="0" width="0" style="display:none;visibility:hidden"></iframe>
</noscript>
<!-- End Google Tag Manager (noscript) →