1. Single vision lens means -the lens has only one power; Bifocal - two powers; Multifocal or progressive is self explanatory.
2. Bifocals/Multifocals are prescribed to give good vision for long as well as short/near .
3. Single vision lens can be made for presbyopia, if there is no power for long distance. The inconvenience is that you have to remove spectacles every time you see a distant object.
4. Sometimes seperate glasses are prescribed for distance and near if someone is not able to adjust to bifocals.
No, you cannot change the bifocal prescription on glasses without changing the lens. The lens is what is prescribed by your eye doctor. The frame, however, can be changed.
Progressive lenses provide presbyopia correction without the tell-tale line of...the bottom of their bifocals, to determine which part of the lens worksbetter.
Without is the correct spelling.
This is caused by an eye's muscle weakning, which is not detectable by an ophtalmologist device, but it detectable with a sight examination. This is called presbyopia.
'Fundraising' without the hyphen is the correct spelling.
Without correct input, a computer cannot produce correct output.
Dry aged steak is correct with or without a hyphen. Dry-aged steak is correct with or without a hyphen.
No. The correct form is "got", without the "had". Example, I got what I wanted.
No it's not correct. The word "am" only sounds grammatically correct with the pronoun of I
There is no way to get oddie without planting his correct seeds.
Contacts are meant to correct your vision. They are supposed to have the same function as glasses without the inconvenience.
without mistakes, correct, exact and precise
Takes place without oxygen
That is the correct spelling of "freely" (without restriction).
The correct spelling is "openness" (without obstruction).
That is the correct spelling of "unpaid" (without payment).
Say the sentence without Michael in it. That is a picture of I. That is a picture of me. Me is the correct choice.
The expression is "have a listen" and it is very informal without being grammatically incorrect.
'Have shrunk' is the correct answer, however you could also use shrank on its own, without the auxiliary verb to have.
The correct spelling is "pobrecita", without a space.
It is correct to write it that way. Free is without charge and seminar means there will be discussion.
No, the pronouns 'his or her' is incorrect.The pronoun their is correct because the antecedent (presenters) is plural."Most presenters spoke without looking at theirnotes."
The plural possessive adjective their is correct, because the antecedent is the plural noun 'presenters'.
Perfect means 100% correct / without any fault.