Optical lens technology has advanced to cater the changing needs of visual correction. There are many types of spectacle lenses to choose from to suit the conditions of wearers activities. If you need a corrective spectacle there are several factors to consider when choosing the right lenses for you. Which types of lenses to pick?, the right materials made from, and suitable coatings to maximise the comfort and clarity.
1,THE TYPES OF LENSES
The types of lenses you choose depend on whether you want to wear the spectacle for constant use or single activities like reading, driving, playing etc.
a,Single Vision Lenses
If you are under age 40 and have prescription glasses then single vision lenses may be sufficient enough for your vision correction. Single vision lenses have the same focal power across the lens to provide a single focus.
b, Bifocal Lenses,
Bifocal lenses have two different focal power for distant vision and Near vision. This is good for reading purposes but there is no intermediate vision available in this type of lenses.
c, Progressive Lenses.
This is also called multi focal lenses or varifocal lenses. Progressive lenses provide a gradual transition in power with in the lens to view all distance from near to far across the room. If you are aged above 40 and have presbyopia, wearing progressive lenses have an advantage to see all distances clearly with out taking the spectacles off and on.
2,THE LENS MATERIALS
a, Glass Lenses
Glass lenses ensures good light transmitting and scratch resistance. However glass lenses are heavy and prone to breakage. Its not recommended for kids and those who are engaged in sports.
b, Standard Plastic Lenses
Standard 1.5 index plastic lenses are the widely used material for low and medium power prescriptions. These are very cost effective and light weight.
c, Mid Index Plastic Lenses
Mid index lenses range in material index from 1.53 to 1.56. This is thinner and lighter than the standard plastic lenses.
d, High- Index Plastic lenses
High- index lenses typically have materials of index 1.60. High index lenses are thinner and stronger than mid index lenses and an excellent option for rimless frames. Polycarbonate, MR8 and Trivex lenses are coming to this category.
e, Ultra High-Index Plastic Lenses
This type of lenses ranges in material index from 1.67 to 1.74,the thinnest lenses currently available for high power prescriptions. Ask your optician what material will be best for you, based on your prescription and the frame style you opt.
3, THE COATINGS.
Lens coatings provide various benefits to the wearer.
a, Hard Coating or Scratch Resistance Coating
Helps to protect lenses from scratches.
b, Anti -Reflective Coating
Helps to improve the transparency of lenses and glare free vision.
c, UV coatings
Protect eyes from harmful UV rays.
d, Other optional Coatings
Smudge reppellent coationg, Water reppellent coating, blue light protection coating
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