Any ruler on the charts?

There is no ruler on the chart, and it didn't come with any ruler. The card does tell you to place the card 6 feet from your eyes to use the standard letter-side. The other side indicates a 36 cm distance. The card itself is about 3.5 x 6.5 inches.

Can the chart be used with a trial lens set to determine prescription?

Not recommended. Not accurate enough

I don't understand when this might be useful and how it can be used to an advantage vs. having a regular sized eye chart on one's wall?

You also do not have to be as far away from it to use it as you would with a large wall chart. This allows for use in places where you do not have room to get farther away. You could also more easily use it for people who are bed-ridden or wheelchair-bound.

Is this rigid, or does it easily fold?

It's rigid. My physicians use it to be into a lab coat pocket. However, my residents preferred the Rosenbaum. It's like a plastic card. If you bend it, it would damage it.

ASIN	B07Y7WGWYN
Age Range Description	Adult
Best Sellers Rank	#102,086 in Health ( See Top 100 in Health ) #201 in Home Medical Tests
Brand Name	PECULA
Color	1* PECULA
Color Family	White
Cover Material	Plastic
Customer Reviews	4.6 out of 5 stars 804 Reviews
Finish Type	Unfinished
Frame Material	Plastic
Frame Type	Wrapped Canvas
Indoor Outdoor Usage	Indoor
Is Framed	No
Is Original Artwork	No
Item Dimensions L x W	198.1L x 106.7W centimeters
Item Shape	Rectangular
Item Weight	18 g
Item weight	18 g
Manufacturer	PECULA
Material	Plastic
Mounting Type	Wall Mount
Number Of Panels	2
Number of Items	1
Orientation	Portrait
Paint Type	Watercolor
Pattern	Letter Print
Product dimensions	198.1L x 106.7W centimeters
Recommended Uses For Product	Vision testing, color vision screening, optometry offices, schools, and for students
Room Type	Office
Shape	Rectangular
Size	198.1L x 106.7W cm
UPC	703145043894
Unit Count	1.0 Count
Wall Art Form	Wall Hanging Decor

PECULA Pocket Eye Chart, Snellen & Rosenbaum (2 in 1), Plastic, White, 7.8 x 4.2 inches, Wall Art, Optical, Indoor

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