I have another enquire as I'm thinking to bring my parent down to make laohua specs. Their current specs are single focal and in quite bad condition. I saw lenskart have the option for bifocal at 188 and progressive at 298 (somemore with 1for1). I saw the difference between these two but what are the actual world difference and any recommendations which to go for?
Firstly Bifocal are lenses that have the visible line on the lenses itself. Basically it has 2 area of vision, the top segment is for distance and the lower segment is for near. There will be no intermediate vision at all for the bifocals. Bifocals do have different designs though e.g. round segment, E-line, etc.
Progressives do not have that line, it looks just like any normal type of lenses Except, it allows you to see Far,Intermediate(computer) and of course near.
Some might ask then why choose bifocal if they have only 2 viewing distances? There are a variety of reasons but the common one would be because for bifocals, it is an immediate change when you scroll your eyes from distance to near zone. This reduces the adjustment of having to roll your eyes through the intermediate zone to reach the reading zone at the bottom which is taxing to some individuals. They prefer to immediately be able to read well when they roll their eyes to their reading zone.
But the perks of progressives are individuals that would require to use computers/laptops and needing to read documents simultaneously, can view all 3 distances at the same time.(though i would recommend using an office lens if you intend to use the computer/reading at near for more than 6-8hrs).
Depending on your budget, 200-300 kodak easy, stellify, zeiss light, 400-600, essilor comfort 3.0, physio 3.0, hoya dynamic premium, lifestyle v+, Zeiss precision plus. more than 700 you can look at essilor X-series, hoya mystyle profile, zeiss superb.