Tag: eye test

5 Easy tricks to measure your pupillary distance (PD)

Knowing the pupillary distance is important to find the right fit of glasses for your face. PD is mostly mentioned in your prescription slip. If you are not a prescription glasses user and you are looking to buy stylish fake glasses or blue light glasses for yourself, then you can only measure it by yourself. 

Don’t worry, it’s not some rocket science. All you need to know is how to use a ruler correctly and you can accurately measure your PD.

Easy Trick Number 1

  1. Stand (at least 30 cm away) in front of a mirror and place a ruler over your overhead
  2. Now, close your right eye and place 0 mm on the ruler over the centre of the pupil of the left eye 
  3. Next, open both eyes and look straight
  4. Now, close your left eye and trace the centre of the pupil of your right eye. The number above your right eye is your pupillary distance
  5. Repeat these steps a few more time to get an accurate reading. For an adult, PD is generally between 54-74 mm
  6. Those with hyperopia can minus 3 from the result to get the accurate PD

Easy Trick number 2

Ask your friend to take the readings for you. It’s difficult to focus on the small readings on the scale by yourself. Also, when you have a vision defect like hyperopia, then it will be difficult to get an accurate reading. Wearing faulty glasses with the wrong PD can cause you a headache, eye pain, blurry vision. You will also have difficulty in focusing. 

  1. Stand still, face straight and look at any object 20 feet away
  2. Your friend will mark the centre of the left eye 
  3. Without getting into the frame of your view, your friend need to mark the centre of other eye
  4. Now measure the distance between both the marks to get accurate PD

Easy Trick number 3

This trick is for a glasses wearer. 

  1. Stand 30 cm away from a mirror with your glasses on
  2. Look straight
  3. Close your right eye and mark the centre of the pupil of the left eye with a non-permanent marker on your glasses
  4. Now open your right eye and look straight
  5. Close your left eye and look straight
  6. Mark the centre of the right eye with a non-permanent marker
  7. Now remove your glasses and measure the distance

Easy Trick Number 4

Instead of measuring PD, find your dual PD. For most people, the distance between the centre of one eye to the nose bridge is not the same for both sides. For such asymmetrical faces, a single PD will not be an accurate reading. This will hinder their viewing. For such cases, a dual PD will be accurate.

  1. Face a mirror at least 30 cm away and look straight
  2. Place a ruler above your forehead and mark the centre of your left eye
  3. Now measure the distance between the centre and your nose bridge
  4. Repeat this for your right eye

You will get a result like 32 for the right eye and 30 for the left eye. In prescription slips, it is written as 32/30. The first number is OD (Oculus dextrus meaning right eye) and the second number is OS (Oculus Sinister meaning left eye).

If both the numbers are the same, then a single PD would work. If both the numbers are not the same, it will hinder your vision. Hence it is necessary to take dual PD to make your glasses.

Easy Trick Number 5

Finding the centre of the eye or focusing on looking straight while marking is a bit difficult task to do. Also, if you cannot take help from any friend, then try out this trick.

  1. Stand still in front of a mirror at least 30 cm away
  2. Instead of locating the centre of the eye, place the 0mm mark at the left end of the left eye
  3. Now measure to the left end of the right eye
  4. To cross-check, place the 0-mark on the right end of the right eye and measure till the right end of the left eye.

A do-it-yourself method is affordable methods but not really reliable. There is room for a lot of errors if you are doing it by yourself. Also, taking the help of others who are not professional is also not a viable option. Your friend may have a vision defect or they did the task sloppily. Anyway, you will suffer from your faulty glasses.

Get an eye test to get an accurate reading. Nowadays, you can avail free eye test while buying glasses. With NHS you can get a free eye test in the UK.

You can even get an eye test at your home or your place of work. You don’t need to take out time to schedule an eye test. Just schedule a time to get an eye test wherever you are comfortable and available.

How does blue light blocking glasses help with eye fatigue?

Computer vision syndrome and blue light blocking glasses are known to work effectively with each other. But before we dive into the working of blue light glasses, let’s dig deep into computer vision syndrome caused by blue light. Computer vision syndrome (CVS) is an umbrella term for the combination of eye and vision problems often caused by blue light rays that are emitted from the digital screens of computers, smartphones, and so on.

Recent research on the study of blue light highlights that a normal individual is exposed to screen for more than 10 hours a day. 

Have you experienced eye problems while staring at a screen? If yes, did the blue light exposure make you feel difficult to focus, causing dry or watery eyes, headaches, dizziness, neck pain and sore, tired and burning eyes?  

What causes computer vision syndrome? 

Computer vision syndrome or Digital Eye Strain is often due to poor lighting, improper sitting posture, uncorrected vision problems, and prolonged exposure to blue light. In a lot of situations, blue light exposure is one of the biggest reasons for computer vision syndrome. Medical News Today also claims that people who work on their computer have a low rate of blinking, resulting in dry eyes. 

The main culprit to all these problems is blue light rays to which our eyes are constantly exposed daily. 

How is blue light harmful?

Not all the blue light is bad, the natural blue light emitted from the sun is quite helpful. Blue light from the sun helps to enhance dopamine, serotonin, and cortisol that’s required for your healthy well-being. However, it’s not the same blue light that causes numerous eye problems, sleep issues, obesity and other physical changes. Blue light rays emitted from smartphones, laptops, office lights and TVs are artificial which when overexposed to you, result in severe vision changes and health issues. 

Artificial blue light rays not only cause eye problems but also disrupt your healthy sleep routine. Blue light exposure into our body ceases the secretion of the sleep-inducing hormone, melatonin. Which tricks our brain to tell our body clock to think of the night as daylight, thereby depriving you of quality sleep at night. Blue light manipulates your brain into thinking of the night as daylight, and making you alert, active and awake.

It’s not at all healthy to use digital devices after sunset as it sends wrong messages to your brain, resulting in sleep deprivation, mood disorder, depression and high anxiety. You are exposed to blue light when you switch on your TVs at night, our check your last email on your smartphone. 

If you feel any changes in your eyes, we recommend you to get a free eye test immediately at Specscart stores in Bury and Walkden. 

How do Blue light blocking glasses help?

Blue light blocking glasses are responsible for blocking 99.9% of blue light rays from digital screens. It prevents your eyes from getting computer vision syndrome and helps you to get quality sleep. With an advanced blue light filter on any cheap prescription glasses or non-prescription, your eyes can effortlessly protect itself from the exposure of blue light rays.

Blue light glasses are designed to block or reflect incoming blue light rays from entering your eyes. Thereby, without any penetration of blue light, you experience a comfortable computer use, better and enhanced sleep routine. You can use blue light blocking glasses night and day to actively protect yourself from blue light. 

You can buy high-quality blue light blocking glasses at Specscart, the Manchester-based startup. With high-grade lens and frame quality, Specscart is reputed to produce one of the most effective eyewear of all times. You get more than 1000+ stunning frames in cat-eye, wayfarer, metallic round, geometric and many more attractive shapes to match your style preference. All glasses at Specscart comes with a free protective coating of anti-glare, anti-scratch and anti-UV on all impact-resistant lenses. You get same-day delivery on all prescription and non-prescription glasses for free. If you too are experiencing eye problems and looking for an effective solution to prevent, then blue light blocking glasses are 100% the best.