Answer: Ft 28 bifocal- Standard bifocal with the line, has the smallest half moon segment: 28 millimeters across. Ft 35 bifocals- Same as the Ft 28 in shape, but 7 millimeters wider (35 millimeters across). Executive bifocals- The line on this lens goes all the way across the entire width of the lens. This lens has the widest reading area of all the bifocals, but has a ledge in the lens that separates the distance and reading segments.

Yes, not all frames are doable with Bifocals or Progressive. The lens height of the frame should be at least 30mm. We want to make it easier for you to identify which frame can or can't be done with Bifocal or Progressive by putting a check or cross mark on the item page. If you need more advise, please don't hesitate to contact our Customer Service Department. See similar questions...

Answer: -- A Barlow lens is a lens that you use with your eyepiece. A Barlow lens will double (2x Barlow) or even triple (3x Barlow) the magnification of any eyepiece that you attach to it. To use a Barlow lens, remove the eyepiece from the focuser, insert the Barlow and then insert the eyepiece into the Barlow. Remember, though, that a Barlow is best used with low magnification (long focal length) eyepieces. See similar questions...

There are many choices on the market-many styles and brands offer just the right options for each individuals needs. Progressives or lineless bifocals/trifocals are some of the most popular styles of lenses for correcting presbyopia (the need for two corrections-both near and far focus points) since they give the most natural vision and are the most cosmetically appealing. See similar questions...

them for another frame making any price adjustment necessary. please see our terms and condition for further information. Your purchase is guaranteed against manufacturing defect for 12 months from the date of purchase. In this instance please return them to us stating the problem and we will resolve any problem. This does not cover damage from accidents or misuse. If you do damage them or scrath the lenses please email us the details and we will let you the cost of repairing them. See similar questions...

A piezoelectric switch (pronounced peezo) contains a crystal that exhibits piezoelectric properties. A piezoelectric crystal converts mechanical force into an electrical voltage, hence, you press the button and an electrical charge is used for ignition. If you have ever started a gas barbeque you have used a piezoelectric switch. Continuous electronic ignition is a constant spark generated from an electrical source. It keeps sparking as long as the heater is on. See similar questions...

C# divides types into two categories - value types and reference types. Most of the intrinsic types (e.g. int, char) are value types. Structs are also value types. Reference types include classes, arrays and strings. The basic idea is straightforward - an instance of a value type represents the actual data, whereas an instance of a reference type represents a pointer or reference to the data. See similar questions...

Answer: The most rewarding mentorships occur when you develop an individual relationship with a professional you have personally met and respect—someone who works in your own specialty. You make contacts with individuals who can mentor you when you pursue educational and networking opportunities such as institutes and conferences. See similar questions...

AMVIC wall is stronger, more soundproof, more resistant to natural disasters, better insulated, has a superior R-value, is more energy efficient, reduces air infiltration and benefits from the thermal mass of the concrete. See similar questions...

Pretty much any type that can be mounted with an adaptor. Despite the feeling, the GT lens is robust enough for most of the converters out there. The 2 new converters Minolta just released (ACW-100 and ACT-100) are both quite heavy with the teleconverter topping at approximately 500g, the same weight as the camera. The 2 converters are shipping and they are distributed with an updated firmware which permit to specify whether no converter, the tele or the wide converter are used. See similar questions...

None. The hydrogen peroxide in Clear Care is neutralized during the six-hour soaking process so that the remaining solution is a sterile saline without preservatives that is similar to natural tears. See similar questions...

No. It is regulated by law within the United States and Canada that prescriptions are brand specific. You can only wear the type of lenses listed on your prescription. See similar questions...

The lens is the part of the eye that helps focus light on the retina. The retina is the eye's light-sensitive layer that sends visual signals to the brain. In a normal eye, light passes through the lens and gets focused on the retina. To help produce a sharp image, the lens must remain clear. See similar questions...

A lens implant (intraocular lens or IOL) is a man-made, clear plastic lens approximately 6 mm in diameter which is placed inside the eye at the time the cataract is removed. It replaces the natural lens and remains permanently within the eye. The lens has small spring-like arms called haptics that prevent the lens from moving out of place. See similar questions...

Full Members represent the most common and fundamental membership type, whereby companies reserve private testing sessions for their product, receive full execution of test suites, and receive detailed test reports containing the test results. Full Members have access to the Wireless LAN Consortium Interoperability Test Bed, and are required to contribute a representative sample of their WLAN product(s) to the interoperability test bed. See similar questions...

Jewel Case (JC): Retail/licensed software manufactured to be sold in Jewel Cases. Generally speaking the manual is on the CD or can be downloaded. CD Sleeve (CD): Full versions of software sold in a sleeve(no Jewel Case). Generally speaking the manual is on the CD or can be downloaded. Some occasions may include OEM CD. OEM CD: Full versions of software sold as "original equipment manufacturer". In this instance, it may not include manufacturers technical support. See similar questions...

Full Members represent the most common and fundamental membership type, whereby companies reserve private testing sessions for their product, receive full execution of test suites, and receive detailed test reports containing the test results. Full Members have access to the FEC Interoperability Test Bed, and are required to contribute a representative sample of their Gigabit Ethernet product(s) to the interoperability test bed. See similar questions...

There are three different types of crowns that can be used to correct your damaged teeth: metal, porcelain attached to metal, and porcelain. All three types of crowns can repair your teeth, but all-porcelain crowns are the only kind that completely restores both the function and appearance of your teeth. During your initial consultation, Dr. Bufo can examine your teeth and make a recommendation regarding crown type based on your specific needs and desires. See similar questions...

Call us on the phone. We'll check available seats, and take your credit card information to reserve a seat. Your card will be charged on the night before you travel. No-show/late cancellation fee is $20. Complete the on-line form. When we receive it, our office staff will check availability, and send you an e-mail confirming a reservation. Your card will be charged on the night before you travel. No-show/late cancellation fee is $20. Call us with your name and contact information. See similar questions...