After a certain age, you will probably start to experience a presbyopia problem. If you are already a person who wears spectacles, then it means that now you should start using bifocal glasses. The conventional bifocals are good in certain ways, but people today are opting for bifocals that do not have any lines in them separating the two lens powers. If you are about to buy a pair of bifocals, then you need to look at these important factors.
Two lens powers
The first thing to keep in mind is bifocal glasses have not one but two lens powers. These types of spectacles are normally prescribed when you have a problem with seeing objects close and also those at a distance. The lower half allows you to focus on objects close to you while the upper part allows you to shift focus so that you are able to see things at a distance clearly.
How do bifocals work?
Wearing bifocal glasses is a good idea as it helps in the control of myopia in children by reducing eye strain. These types of glasses work in a certain manner. A part of the lower half of the lens is designed to help your eyes focus on objects close to your eyes. The upper part of the lens has a different power and this power allows your eyes to focus on objects at a distance.
The lower half is for reading and the upper half is for distance viewing
In bifocal glasses, the lower half may be either round or half-moon shaped or it may contain a narrow rectangular section. When using your bifocals, you need to look down in order to view objects that are close to you. Typically, this is the part of the lens that allows you to read a newspaper or see something that is not far from your eyes. When you look up, your eyes immediately focus on things that are at a distance.
Invisible bifocal
In between the two parts of the lens, there is a line that helps you distinguish between the lower half and the upper half of the lens. There is another type of bifocal that is known as the invisible bifocal. In this type, the round segment has the visible line removed. However, when using the invisible bifocals, your eyes might suffer from certain optical distortions.
Progressives are an alternative solution
If you really wish to wear bifocal glasses that do not have lines in them, then you should go with glasses known as progressives. On the other hand, if you perform certain work, then you may want to choose the occupational bifocals which are designed to suit a particular job or hobby. Golfers who have problems focusing on the near-portion of their bifocals often are recommended to wear occupational bifocals. These glasses are actually called golfer’s bifocals. In this kind of bifocal glasses, there is a small segment near the lower outside of one lens. Right handed golfers will find this part in the right lens while lefthanders will notice it on the left lens.
For optimum vision, it makes sense to go with bifocals that have the right lens coating. This ensures comfort as well as a nicer aesthetic look.