12 - Computer Lenses (Exam 3) Flashcards
What is another name for computer lenses?
Near/ variable focus lenses
What are 3 things that can cause computer vision syndrome?
- Extensive work at a computer station
- Improper ergonomics
- Wrong lenses used for the task
What are rough prices for CR-39 and poly computer lenses?
CR-39 - $150
Poly - $200
About how many types of computer lens designs are available today?
50
Constantly growing
Should you use distance or near PDs for fitting computer lenses?
No universal rule
Use manufacturer guidelines
What frame measurement is very important with computer lenses?
B-measurement
Frame height
What types of materials can be used for computer lenses?
Any optical material other than glass
Are computer lenses only for computer work?
No
Can be used for a variety of arms length tasks
What is a major difference in computer lenses from an everyday Rx?
Task specific
Typically remain at the workstation
How are ‘task specific’ lenses verified?
Near zone should have power of near Rx
What are 3 benefits of computer lenses?
- Relatively inexpensive
- Easy to fit
- Patients likely to repurchase another pair over time
What should you do if your patient uses electronic devices for more than 3 hours per day?
Prescribe computer (or task specific) lenses
How do labs prefer to receive prescriptions for computer lenses?
Either the near or distance Rx with its associated PD
What is a major variable in all computer lenses?
Intermediate distance
What variable stays roughly the same for all task specific lenses (within 0.5 feet)
Near focal point
