SIKÇA SORULAN SORULAR

Frequently asked questions


What are the main types of eyeglasses?

 

Eyeglasses are classified by their functions, substances and types of fitting.

 

By functions;

 

a) Optical Eyeglasses: Eyeglasses fit with dioptric (numbered) lenses,

b) Sunglasses: Eyeglasses for protection against harmful sunlight,
c) Safety Glasses: Glasses worn to protect eyes against any harm during a variety of task

d) Sporting Glasses: Glasses worn by specific sports branch,

 

By substance;

 

a) Metal Glasses
b) Plastic Glasses
c) Combined Glasses (both metal and plastic)

 

By Fitting;

 

a) Full-Loop Glasses,
b) Semi-Loop (Nilor) Glasses,
c) Non-Loop, Screwed (Facet) Glasses

 

What are the types of lenses?

 

Lenses are also classified by raw materials, refractive index and functions.

 

By raw material;

 

a) Mineral lenses
b) Plastic lenses
c) Photochromic (colormatic) lenses

By refractive index;

 

By function;

a) Dioptric (numbered) lenses,
b)Sunglasses lenses

Dioptric (numbered) lenses are divided into 3 sections;

 

a) Single focal
b) Bifocal
c) Varifocal (Progressive, Varilux) lenses.

 

What is U.V.(Ultraviolet)?

 

Ultraviolet is one of the rays in wide spectrum of energy emitted by the sun. UV lights are “ultraviolet” lights. U.V. lights are divided into three by wavelengths as U.V-A, U.V-B and U.V-C. UV lights both have benefits and damages. U.V. lights that directly affect the eyes cause injury on eyes leading to visual problems. The best method to protect against such damages is to wear eyeglasses with protection against U.V. lights.

 

What is A-R (Anti-Reflective)?

 

While lenses transmit most of sunlight, some refract and reflect. Anti-reflective is a type of coating that minimizes such reflections. Minimizing light transmittance enable seeing objects clearer while improving visual quality.

 

What is polarized?

 

Sunlight moves in any direction in waves. Light waves moving from an unwanted direction cause reflections on objects while degrading visual quality. Polarized is a type of coating that enables light emit through a certain direction. Polarized lenses must be used for high-quality vision.

 

What is base in glasses and lenses?

 

Lenses must be in a certain curve according to diopters. Such curve is called the base. Lenses must be in suitable bases to keep optical quality for lenses. For example, using low-based lenses for convex curved sunglasses decrease optical quality.

 

How to choose ideal eyeglasses?

 

The best method in choosing eyeglasses is to get professional assistance. The best place is scientific optical offices in our country. One should call on scientific optical offices in order to choose aesthetic eyeglasses conforming to glasses, which are conforming to prescription and to facial features of wearer.

 

What is decentralized?

 

Sometimes focal points of lenses may not correspond to pupil as to eyeglasses. In case of a deviation from standards, focal points of lenses are aligned with decentralization. Always decentralized lenses must be used for convex sunglasses.

 

What are the important points in wearing eyeglasses?

 

Eyeglasses are essential medical aids and their use requires attention. Please obtain manuals and recommendations from scientific optical offices about ideal eyeglasses.

 

Which sunglasses to prefer for driving?

 

The most ideal sunglasses for driving are sunglasses with polarized lenses that prevent loss of vision due to sunlight from unwanted directions.

 

When to wear sunglasses?

 

There is a common misconception about the use of sunglasses in our country like sunglasses should be worn only in sunny days of summer. However, sunglasses should also be worn in winter. In particular, wearing sunglasses in snowy and sunny environment is of great importance. Sunglasses should not be worn at nights.

 

Where to buy eyeglasses?

 

Lenses and substances of high-quality eyeglasses must not harm health. Sunglasses purchased from elite optical shops ensure such guarantee. Lenses must retract U.V. lights and coating of glasses must prevent any damages on skin.

 

Glasses: accessories or medical aids?

 

There is a misconception claiming that sunglasses are accessories. High-quality sunglasses are also useful medical aids.

 

Where to buy glasses?

 

While lenses transmit most of sunlight, some refract and reflect. Anti-reflective is a type of coating that minimizes such reflections. Minimizing light transmittance enable seeing objects clearer while improving visual quality.

 

Glasses: accessories or medical aids?

 

While lenses transmit most of sunlight, some refract and reflect. Anti-reflective is a type of coating that minimizes such reflections. Minimizing light transmittance enable seeing objects clearer while improving visual quality.

 

How to wear sunglasses?

 

Proper use of sunglasses prolongs their life. Sunglasses must be put in and taken off with both hands like any other glasses. Wearing and taking off with a single hand misbalances sunglasses. Lenses should also not contact with hard surfaces. Any scratch on lens would degrade visual quality. Lenses should be wiped with a soft cloth by holding at the balance point of glasses. Wash sunglasses with lukewarm water prior to wiping dusty lenses. Do not use chemical containing liquids or coatings on our glasses and lenses would get damaged. Have your sunglasses checked by a scientific optical shop from time to time. In particular, woman sunglasses are sometimes worn as hairbands which leads to misbalance and damage on coating. Keep your sunglasses in their protective casing or box while not wearing.