Pros:

• Great product especially in this era wherein people has access to smartphones and computers, and of course that affects the vision of the people, so this device is very helpful since it gives the user the chance to monitor his/her eyesight.
• Very great aid also to those people who monitor the grades of their eyeglasses, since they have the chance to check for themselves if he/she needs to have his/her eyeglasses be upgraded or not.
• Very handy and very convenient to use.
• price is very reasonable and highly recommended to be bought with just $90 you will have long term use for this product.

Cons:

• Nothing for this product. This is very helpful actually.