Glasses and Eyewear

Polarised sunglasses are generally better then tinted sunglasses because vision clarity and reducing glare especially for sports activities.

The best Choice is Polarised sunglasses because they are beneficial for our eyes , However tinted lenses are preferable for certain activities like skiing etc.

Normally you should try to stay in the type of lense you have worn before. Your eyes will have become accustomed to seeing through this particular material and changing the material will cause some initial distortion. Avoid polycarbonate lenses in high plus prescriptions. ---- The question above does not have a simple answer as there is no one single lens that is the "best". There are a number of different factors that need to be taken into account when deciding which lens is the most suitable. The first thing to say is that there are many different manufacturers out there, with different brand names for their products; however, broadly speaking there is little to choose between different brands. Firstly, as a rule of thumb, the higher your prescription - the higher the index that you need. A standard lens is considered to be 1.5 index. In the plastic materials the usual choices are 1.6 / 1.67 / 1.74. In glass 1.6 /1.7 / 1.8 / 1.9. While Glass lenses are available in higher indecies than the plastic, the glass lenses are usually considerable heavier and therefore less well appreciated by patients. Secondly, the reason a person will want a high index lens is to have a finished pair of spectacles that are thinner, lighter and more comfortable to wear. Your choice of spectacle frame will heavily influence the final finished job. Generally the smaller the frame the better the finished lenses will be [for both short and long sight]. An aspheric lens design will generally give a thinner and better cosmetic appearance and often better peripheral vision. This makes a bigger difference in a plus [long sight] prescription. An aspheric 1.6 index lens will finish better for a long sight prescription than a higher index 1.67 lens in a spheric design. All high index lenses need an anti-reflection coating to reduce unwanted reflections from the lens surface- most high index lenses come with the coating as standard, though some places supply the lenses without a coating to reduce the cost [not a good idea]. Speak to your optometrist or dispensing optician and have them explain their decision but my advice is to choose a small frame, with a plastic high index lens with an aspheric design including an antireflection coating. Exactly which index will depend on your prescription and how much you want to spend. The brand or product name is irrelevant!

Scratches on polycarbonate lenses are hard to remove due to their protective coating. You can try:

• Microfiber cloth & cleaner to wipe away dirt.
• Baking soda paste – Apply gently, then wipe clean.
• Toothpaste – Rub for 10 seconds, then rinse.

For deep scratches, lens replacement is the best option. Eyeglass Direct offers affordable, high-quality lenses with scratch-resistant coating for future protection.

To see if your glasses are polarized, look through them and tilt them at different angles. If they get darker or change color, they’re likely polarized. You can also check for a label on the lenses that says polarized.

A piece of glass in a frame is commonly referred to as a framed glass or glass pane.

If someone calls you "four eyes," they are likely teasing you for wearing glasses. It is a common derogatory term used to mock people who need corrective lenses for vision. You can respond by confidently owning your glasses and explaining the importance of taking care of your eyesight. Remember, wearing glasses is a sign of responsibility and self-care.

Well, friend, there are several places where you can get a free eye exam. Some options include local health fairs, community clinics, or charitable organizations that provide vision care services. Don't hesitate to reach out and explore these resources - taking care of your eyes is a wonderful way to show yourself some love.

Modern eyeglasses are commonly made of plastic polymers such as cellulose acetate, nylon, or polycarbonate. These materials are lightweight, impact-resistant, and can be easily molded into different shapes and colors.

If you can see ultraviolet light, it could potentially cause damage to your eyes as UV light is harmful to the eyes and can lead to conditions like cataracts or photokeratitis (sunburn of the eye). It is important to protect your eyes from excessive UV exposure by wearing sunglasses that block UV radiation.

Limestone is used for making glass because it helps to stabilize the glass and increase its durability. When limestone is added to the glass mixture, it acts as a flux, helping to lower the melting point of the raw materials and make the glass easier to work with. Additionally, limestone can also improve the clarity and transparency of the glass.

A black surface appears black because it absorbs light, not because it reflects light. When you see a reflected image on a black surface, you are most likely seeing a reflection from another surface nearby, such as a mirror or a lighter object. The reflection is bouncing off the other surface and then being seen on the black surface.

No, turpentine is not recommended for cleaning glass. It is a solvent that can leave behind residue and streaks on glass surfaces. It is better to use a glass cleaner specifically designed for cleaning glass to ensure streak-free results.

Magnetic glass is a type of glass that has magnetic properties. It is often used in modern laboratories and research facilities for various applications such as magnetic stirring, separation of materials, and analysis processes. The glass typically contains embedded magnetic particles that respond to external magnetic fields.

Glass acts as a transparent barrier that bends and refracts light rays, allowing them to converge or diverge in a way that allows us to see objects more clearly. This process helps focus light onto the retina of the eye, enabling us to see distant objects with greater clarity.

To fix warped plastic eyeglass frames, you can try using hot water to gently soften the plastic and then reshape the frames back into their original form. You can also visit an optician or eyeglass repair shop for professional assistance. If the frames are severely damaged, it may be best to replace them.

Eye protection is used in a laboratory, as else where, to protect your eyes and prevent them from being injured in an accident. The kind of eye protection used depends on the activities being performed in the lab, the kinds of materials being used, and the nature of potential hazards.

Narcissists continually test their companions/mates/spouses - "If she knows my true character will she abandon me"? It would be a mistake to attribute this kind of behavior to altruistic motives. From my experience with an N, they would never say that anyone is better than them. It is probably just a trick to get supply out of you, make you feel sorry for him, because believe me, they don't think anyone is better than them. Yes, to manipulate you.

Determing the condition (or grade) of a coin requires three things: Experience, References and being able to visually inspect the item. Some would argue that visual inspection is not necessary and can be accomplished utilizing photographs. Unfortunately, lighting plays a key factor in hiding/exposing flaws on a coin depending on the reflection and angle. There are many references available, both on the Internet and printed media, to assist in the grading of coins. Simply use any search engine, type the words "Coin Grading" and you will have a host of links to choose from. A good printed source is "The Official American Numismatic Association Grading Standards for United States Coins". This book has reference pictures, as well as, descriptions for each coin in each grade. Whichever resource you choose, ensure that they follow the grading guidelines established by the American Numismatic Association (ANA). Last, but probably most importantly, experience is the key in assigning a grade to a coin. Novice collectors, with some practice, can become quite accurate in determining grades for circulated coins (G-4 through AU-50). It becomes much more difficult when assigning grades for Uncirculated coins (MS-60 through MS-70) or Proof coins (PF-60 through PF-70) and the assistance of an experienced coin collector or trusted coin dealer should be sought. Another option that is available is to have the coin graded by a third-party grading service. For a fee, the grading service will grade the coin, place it in a protective case with it's identifying information and then sonically seal the case to preserve the coin. There are many services to choose from, some reputable and some not. Seek the assistance of a knowledgable collector or dealer in determing a service to use.

A very simple method to calculate the focal length of a lense is to focus it front of the sun and find out a sharp, small point at ground and you have to calculate the distance between that point and lense.... However this gives you approximate result not very accurate resut... For accurate result you have to go in to physics lab and work with optical bench... Thanks