High Index
This type of prescription usually needs thinner and lighter lenses.
What is high index or high prescription?
We refer to these as multifocals or ___________ lenses.
What is progressive?
Myopia means the patient has difficulty seeing this distance clearly.
What is far away?
This measurement ensures the optical center of the lens aligns with the patient’s pupils.
What is PD — pupillary distance?
This term refers to how easily a patient adjusts to new lenses.
What is adaptation?
The higher a minus prescription gets, the _______ the lens edge becomes.
What is thicker?
The gradual change in power from top to bottom of a multifocal lens is called the ________.
What is the corridor?
Presbyopia is a natural result of this process that reduces near focusing ability.
What is ageing?
This vertical measurement determines where the progressive corridor or segment begins.
What is fitting height/heights?
This simple rule of communication ensures we recommend based on patient needs.
What is asking lifestyle questions?
A prescription stronger than this combined power usually benefits from a high-index material.
What is ±3.00D or higher?
In progressive lenses, this determines whether a lens is more suited to seeing far away or up close.
What is near/far bias?
Hyperopia and presbyopia both cause near blur — but for different reasons. Name one key difference.
What is hyperopia is refractive, presbyopia is age-related loss of flexibility.
The Rule of Panto: Drop the height by 1 mm for every this many degrees of pantoscopic tilt.
What is 2 degrees?
When a patient struggles to adapt to new progressives, this is the first factor to recheck.
What are fitting heights and measurements?
High-index lenses require this type of coating to reduce reflections caused by their denser material.
What is UCSC?
A patient has a -4.00 SPH, with a -1.25 CYL, and a +0.75 Near Add. What lens design and thickness would be ideal?
What is 1.67 Definition?
A myope with a strong minus prescription “craves” this kind of clarity in their lenses.
What is distance clarity?
Why would low Rx patient with eyes sitting high in their frame need a height measurement taken?
What is their eye is too far from the optic center?
The two main benefits of having UCSC coating on a high index lens is to what?
What is reduce reflections and increace clarity?
If a lens is +4.00 / –2.00 × 180, what’s the total power at 180°?
What is +2.00 at 180°?
A high presbyopic patient needs a pair of multifocals optimised for their knitting hobby. What do you reccomend?
What is HDV with a Near Bias?
A presbyope’s Near Add makes the lower portion of a multifocal lens more this (plus or minus).
What is plus and/or thicker?
Name one step during fitting that ensures optimal alignment of the optical center in high-index lenses.
What is checking visual acuity, panto, wrap, and nosepads?
In which direction does a progressive or multifocal graduate?
What is top to bottom?