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        <p class="content">July 29 2016</p>
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      <h1 class="title"><a href="/blogs/news/blue-lights-affect-not-only-your-vision-but-also-the-quality-of-your-sleep">Blue lights affect not only your vision but also the quality of your sleep.</a></h1>
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        Written by William Chen - July 29 2016
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<img height="1" width="1" style="border-style:none;" alt="" src="//googleads.g.doubleclick.net/pagead/viewthroughconversion/937295644/?value=0&amp;guid=ON&amp;script=0"/>
</div>
</noscript>
  

<script>
    if(typeof(Spurit) === 'undefined'){
        var Spurit = {};
    }
    if(!Spurit.Preorder2){
        Spurit.Preorder2 = {};
    }
    if(!Spurit.Preorder2.snippet){
      Spurit.Preorder2.snippet = {};
    }
    if(!Spurit.Preorder2.snippet.products){
      Spurit.Preorder2.snippet.products = {};
    }
    Spurit.Preorder2.snippet.shopHash = '9145d9b08cb2dac00b59c009239dc1bd';
    Spurit.Preorder2.snippet.cacheTimestamp = 1591273002;

    if(typeof(Spurit.globalSnippet) === 'undefined'){
        Spurit.globalSnippet = {
            shop_currency: 'USD',
            money_format: '${{amount}}',
            cart: {"note":null,"attributes":{},"original_total_price":0,"total_price":0,"total_discount":0,"total_weight":0.0,"item_count":0,"items":[],"requires_shipping":false,"currency":"USD","items_subtotal_price":0,"cart_level_discount_applications":[]},
            customer_id: ''
        };
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</script>

<style> /* Safely hide ATC button */
    body:not(.spo-loaded) [data-shopify="payment-button"], 
body:not(.spo-loaded).template-product form[action="/cart/add"] [type=submit], 
body:not(.spo-loaded).template-collection form[action="/cart/add"] [type=submit], 
body:not(.spo-loaded).template-index form[action="/cart/add"] [type=submit], 
body:not(.spo-loaded) form[action="/cart/add"] [type=submit] {opacity: 0; pointer-events: none}
    body:not(.spo-loaded) form[action^="/cart"]:not([action^="/cart/add"]):not(#currency_form) button, 
body:not(.spo-loaded) form[action^="/cart"]:not([action^="/cart/add"]):not(#currency_form) input[type="submit"], 
body:not(.spo-loaded) form[action^="/cart"]:not([action^="/cart/add"]):not(#currency_form) input[type="button"], 
body:not(.spo-loaded) [name="checkout"], 
body:not(.spo-loaded) [name="goto_pp"], 
body:not(.spo-loaded) [name="goto_amazon_payments"] {opacity: 0; pointer-events: none}
</style>
<noscript>
    <style> /* if no javascript: get back ATC button */
        body:not(.spo-loaded) [data-shopify="payment-button"], 
body:not(.spo-loaded).template-product form[action="/cart/add"] [type=submit], 
body:not(.spo-loaded).template-collection form[action="/cart/add"] [type=submit], 
body:not(.spo-loaded).template-index form[action="/cart/add"] [type=submit], 
body:not(.spo-loaded) form[action="/cart/add"] [type=submit] {opacity: 1; pointer-events: all}
        body:not(.spo-loaded) form[action^="/cart"]:not([action^="/cart/add"]):not(#currency_form) button, 
body:not(.spo-loaded) form[action^="/cart"]:not([action^="/cart/add"]):not(#currency_form) input[type="submit"], 
body:not(.spo-loaded) form[action^="/cart"]:not([action^="/cart/add"]):not(#currency_form) input[type="button"], 
body:not(.spo-loaded) [name="checkout"], 
body:not(.spo-loaded) [name="goto_pp"], 
body:not(.spo-loaded) [name="goto_amazon_payments"] {opacity: 1; pointer-events: all}
    </style>
</noscript>
<script>
  (function() {
    setTimeout(() => document.querySelector('body').classList.add('spo-loaded'), 5000)
  })();
</script>

    <script src="https://amaicdn.com/preorder2/common.js"></script>

  <script src="//cdn.codeblackbelt.com/js/modules/currency-converter-plus/main.min.js?shop=retinaguard-store.myshopify.com" defer></script>
</body>

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