prescription glasses and a book

How Do Prescription Glasses Work?

Over 75% of Australians need prescription glasses to focus their eyes. But what is it about prescription glasses and the lens that can somehow correct their blurred vision? How do prescription glasses use refraction of light to their wearer’s advantage? To understand this, we have to go into their history and the science of light refraction.


What is light refraction?

Light Refraction refers to how light bends when entering a medium where it’s speed is different. These light rays change direction when reflected off of a surface, travel through a medium which composition is changing or moves from one transparent medium to another. This can be easily observed when putting a pencil into a glass cup of water, and observing from the outside. The pencil appears to enter at one direction and is displayed in a different view from where it was put it. This is the work of light refraction.


How do our eyes see?

In order for our eyes to see, light must be shown unto the pupil and the cornea (the curved outer surface of the eye). These both curve and shrink received images to be focused onto the retina (in the back of the eye). The images that the retina receives, is what the brain sees. Perfect vision occurs when the pupil and cornea perfectly adjusts any incoming light to focus clearly on the back of the retina. However, if the incoming light is not properly adjusted and is focused onto the front of the retina, your ability to see distance will be faltered, causing what is known as being nearsighted. Likewise, if the incoming light is not properly adjusted, and is focused behind the retina, that is known as being farsighted.


Creation of prescription glasses and how they correct eyesight

By the 13th century, glassblowers from Italy discovered prescription glasses by determining that different glass lenses could be constructed to alter and correct eyesight by using light refraction. This was done by creating lenses of different thicknesses which would alter the eye’s focus, in order to correct vision problems. The first of these lenses was concave-shaped lenses, which had a thick perimeter and a thin centre. This shape moved the eye’s focus back towards the retina in order to correct nearsightedness. The second lenses were convexly shaped, with a thick centre, which moved the eye’s focus forward to correct farsightedness. The final lenses were of cylindrical shape. The thickness/thinness of the lenses was asymmetrical, in order to correct astigmatism. As technologies advanced, these lenses were plastic frames, and thus, the prescription glasses were born.


Glasses in modern times

The 20th century ushered in the age of prescription glasses, through fashion accessories and the development of strong plastic lenses, thanks to the Industrial Revolution. The range of prescription glasses became very broad, with spectacles having different colours, shapes and sizes. Likewise, the use of sun spectacles for protection against the Sun’s harmful UV rays and the sunlight glare became extremely popular. In addition to this, prescription sun spectacles too became very popular amongst the populace, specifically with athletes, those involved in sports and outdoor-oriented enthusiasts. This allowed a wider demographic, as it allowed people to enjoy the outdoors whilst also being able to see correctly, and doing it in style.


The history of prescription glasses is long, and the science behind them is fascinating. We are lucky in these modern times to have access to such prescription glasses and their range of styles and variety, not only correcting our eyesight but also keeping us in fashion.


doctor's stethoscope

3 Ways A Home Doctor Is Beneficial

When you need medical attention or advice, then you naturally need to go see your local GP. However, these professionals work on a regular schedule like everyone else and you may need to engage with a Brisbane home doctor instead if the situation is urgent.

These professionals work irregular shifts overnight so that they can address urgent medical issues and help people who may not be able to see a GP during normal visiting times (they may have long work schedules themselves.)

Therefore, there is a lot of utility to seeing a Brisbane home doctor, and the following will examine some of the best benefits of them.


1.    They can handle emergencies

The main utility of a Brisbane home doctor is that they are able to see patients outside of the regular visiting times of traditional medical practices. This means that people who are in emergency situations can get treatment straight away instead of waiting until morning.

This is why many clinics of these professionals exist within or adjacent to hospitals, as they allow medical expertise to be close at hand and help people who have been rushed there in an ambulance. It is also useful for the middle of a road accident that needs attention but aren’t necessarily life-threatening, such as needing stitches on a wound despite the bleeding being under control.

In these types of special situations, waiting until morning to get stitches or some other corrective procedure is not ideal, and you want to get treatment without burdening the hospital system. This is one of the main ways a Brisbane home doctor can be extremely helpful to you.


2.    They enable more people to engage with medical experts

doctor-client consultation online

Many jobs make it difficult or downright impossible for certain people to see a GP during regular visiting times that are not a problem for other people. If you just need a checkup or to talk about an ongoing issue then you don’t want to take time off work just for a small visit, and this is where seeing a Brisbane home doctor becomes extremely beneficial.

This is good for the obvious reason that it enables more people to more easily access the services of medical professionals at irregular times. When more people are getting issues addressed in a timely manner, then it means a healthier society and better outcomes for basically everyone.

This could potentially be something that ends up saving lives since someone who might not have found it convenient to try and see a regular GP could instead go to see a Brisbane home doctor and get their problems handled. Since saving and improving lives is the main point of the medical profession, it makes sense that this type of system would be encouraged and supported throughout society.


3.    They make society healthier in general

When you have Brisbane home doctors working, it means more people get medical attention and as a result, more people are happier and healthier. These outcomes can only ever be a good thing for wider society and sick and dying people are never good to have.

While obviously not all lives can be saved or conditions cured, these experts allow a greater percentage of positive experiences to be had and therefore can be counted as a net positive to the society we live in. There’s absolutely no reason why a Brisbane home doctor would have to be removed or gotten rid of.

There you have it, a deep examination of all the reasons that Brisbane home doctors have so much utility and effectiveness in our society at large.