Physics Questions
Explore questions in the Physics category that you can ask Spark.E!
The ______ is the central area with prescribed lens power in a lenticular lens.
What recommendations would you NOT give your high myopic patient for frame/fitting considerations? A) lens enhancementsB) aviators C) small eyesizeD) minimal vertex distance E) symmetrical shape
The nature of retinal images are the following (pick 4): A) realB) virtual C) uprightD) invertedE) larger than the object F) smaller than the object G) concaveH) convex
The _______ is from a point on the object which goes through the center of the entrance pupil, and the center of the blur circle on the image.
Do basic impact safety lenses have scratch resistance?
If spectacle lenses are worn under protective eyewear designed for this purpose, they should be ______.
A lens is _______ by heating it and allowing to cool slowly.
Which of the following is false about high impact safety lenses? A) must pass a high impact test: force of 1/4 inch steel ball traveling at 150 ft/secB) minimum thickness of 2.00 mmC) must apply AR coating D) must pass impact requirement for basic-impact lenses
Which of the following is not a characteristic of a basic impact safety lens? A) avoid AR coatings due to reduced impact resistanceB) must be able to withstand impact of a 1-inch steel ball dropped from 50 inchesC) must be fit only into a safety frame and NEVER a dress frame D) minimum thickness of 2.00mm
What are two things you should never do with regular frames/lenses and safety frames/lenses?
What are the two categories a safety lens can be classified as? How are they marked once it is edged?
This type of lens is known for its high impact resistance. Comes from manufacturer with an anti-scratch coating and UVA/UVB protection.
The ______ is a federal agency that regulates safety practices in the workplace and educational settings. Regulations have the power of law.
Specific warnings to accompany ASTM approved eyewear. Which of the following apply? A) if lens pops out due to impact, stop playing and have it replacedB) allow protector to return to room temperature if stored at cold tempsC) if protector is severely impacted it must be replacedD) replace lenses when scratches become troublesome or cracks appear E) all the above
A basic impact safety lens must have a minimum thickness of _____ mm, except that lenses of +3.00 or greater may have a minimum edge thickness of _____ mm.
ANSI (american national standards institute) is a nongovernmental agency composed of representative segments of the ophthalmic industry. Does it have regulatory authority?
Many injuries could be prevented by ______. It is removable or permanent. Permanent is preferable. Not exchangeable from frame to frame.
The standard impact resistance test is _______.
Each lens must be tested _________ after edged and hardened. A) in bulkB) a few at a timeC) individually
What type of lens can be tested before it is edged (uncut-finished stage)?