Archive for eye chart test
Eye Chart Test Use – Video
Posted by:During an eye test, eye doctors use eye charts to measure how well you see in the distance.
The classic example of an eye chart is the Snellen eye chart, developed by Dutch eye doctor Hermann Snellen in the 1860s.
In the TEST window, press the TEST key in order to access: the eye-chart tests are situated on the left column, which corresponds to the group test 1 yellow key.
Select a test and press CHANGE in order to start it. The test comprehends three eye-chart lines with increasing visual acuity value. In the right edge and in the bottom are showed the data related to the displayed table.
In order to display or hidden these data, press the DATA key. All eye-chart tests have the same functions:
• the UP and DOWN keys permit to increase or decrease the visual acuity value;
• the CHANGE key allows to choose in a pseudo-random way other stimuli to display;
• the left arrow and right arrow keys permit to modify the contrast of the table displayed, according to the logarithmic scale of the sensitivity to the contrast.
In order to change the display of the table, you can use the CHAR, LIN and DIM keys:
the CHAR key allows to display a single type,
the LIN key allows to display either a single or more lines,
the DIM key allows to display lines with equal or increasing visual acuity.
There are two other possible displays by pressing the RED e GREEN key; the table will be divided with a green background on the right and a red one on the left.
The BLACK and WHITE key, on the contrary, allows to invert the background colour with the eye-chart one.
Obviously, whichever is your display, it is possible to change the displayed stimuli by pressing the CHANGE key.
The test works according to a scale chosen in the Scale SETUP menu, as displayed in this window.
With the single type display, by pressing the CHAR key, it is possible to insert the Crowding effect by pressing the RED and GREEN key on the remote control.
1) I would like to buy, but how can I be sure about the high quality of your products?
An excellent result has been obtained: the percentage of products come back for repair is lower than 0,5%. The costs of expedition for repair are so zeroized and the profit of our distributors/resellers is intact, as the whole high satisfaction of the final customer.
The feedbacks from our main customers confirm us that VistaVision quality is very high:
* “Our evaluation is good. The relation price / features is good, so I think that we can expect good sales in our country. – Yes we have received them and displayed them at the trade show. There was a lot of interest. We will be placing an order for more units.”
* “We are very excited about your product and plan to sell many.”
Your money for demonstration units (25% off) is without risk: read ‘refund policy’ in distribution agreement proposal.
Have you tried VistaVision? Please send us your feedback!
2) What is the Distribution Proposal (DP), and what does it contain?
Our Distribution Proposal is an exclusive sale agreement between DMD Med Tech and the distributor who wants the exclusive marketing for the VistaVision, on a specified country.
Inside the DP you will find the prices and the discount depending on the annual purchased amount. Please, note the possibility to buy one evaluation unit at 25% off, to let you begin easily your commercial work.
The only commitment we demand to an exclusive right distributor is just a minimum annual withdrawn amount, in order to maintain the exclusive right.
3) We would like to distribute this product under our own trademark, could it be possible?
We consider the possibility (usually arranged to prestigious distributors, who are able to realize high amounts each year) to distribute VistaVision not as a DMD Med Tech product, but under their trademark/brand.
In this case, the distributor could personalize the product name, the logo, the serigraphy, the labels, all the informations inside the software, the user manual, etc., as it would be a product developed by the distributor himself.
If you are interested in a product markable with your brand, please visit the ODM Chart System page and send us an email with the following informations:
- estimated quantity/year
- required territory limits
we’ll send you a proposal agreement.
4) I signed the distribution agreement. What information do you give to whom you are contacted by?
Each commercial contact coming from your exclusive right territory, will be immediately send to the right area distributor. We commit to insert your company name and contact information on our distributors page, as you shall commit to show on your website the products purchased from DMD Med Tech (pictures and features).
From our download area you can obtained high quality images of all the products (in order to insert on your catalogue), as other informations to fit in the product webpage on your website.
5) My customers want to maintain up-to-date the product they buy: how can I do?
Our automatic updating system “VUP” is available.
A VUP is a USB flash disk ready to use. It is provided by DMD Med Tech to the users, to update automatically VistaVision to the last software release, in just 3 minutes.
Buy a VUP for each VistaVision and the final customer will benefit of a valuable service: free updating forever! Click here.
Is VUP an ordinary USB flash disk? Not at all! VUP is a programmed with an ad-hoc Linux operation system called openmamba, supplied by mambaSoft.
6) Is it possible to pay the evaluation unit once tested the high quality?
Sorry, we understand your needs, but it’s not possible to test the evaluation unit before purchasing it.
In any case, remember that DMD Med Tech will refund the purchase money for evaluation unit if you’ll send it back (read refund policy in distribution/reseller agreement)! Note that until now, this situation never happened.
Remember that evaluation base unit is 25% off.
7) What is the purchasing procedure?
Send an order (by email or fax or web), in accordance with the distribution/reseller agreement, please indicating:
# your PO number
# products codes (see ‘Item list’ on product page)
# amount
# your courier code (es: TNT 12345678) or ask for our shipping service
# delivery address
Within 3 days maximum, (usually you will be answered in 1 day), you will be sent a P-invoice, with the ETD (Estimated Delivery Date) as a PO confirmation.
The customers with “T/T in advance” payment terms, should send the wire transfer receipt no later than the ETD.
The goods will be picked up within the ETD; if you prefer our DMD Med Tech courier, you will be provided of the AWB code (tracking number) immediatly after courier pickup.
How to reduce shipping cost?
Products delivery is EXW, in accordance with the distribution/reseller agreement.
DMD Med Tech designed an ad hoc pallet, with the right dimensions to minimize shipping costs (depending on the whole expedition volume). We suggest you to buy parcel of VistaVisions of 3, 6, or 12 units, to obtain maximum efficiency.
Further, DMD MedTech stipulated an agreement with TNT to get very low shipping costs, probably lower than you could get (as we make high amount of expeditions each month). So a way to save your money is to order the goods with shipping included. Contact “Sales” to know shipping cost and shipping time.
9) Why is necessary to login? How to get an account?
Our products are continuously improved to satisfy customers needs. To preserve our efforts and to ensure this benefit for our customers we have been forced to introduced a restricted download area. The updates are free, available for all our customers through a login on the reserved area “Support-Downloads”. (No account yet? Register). Obtaining an account is easy: insert the S/N impressed on the box or on the label on the back of the instrument.
10) Right of Withdrawal
In case of direct sales to end user (i.e. not for resellers or distributors), the customer has the right to revoke his / her contractual statement without stating reasons within 2 weeks by either sending a receipt of the goods in writing (e.g. Letter, e-mail, fax) or by returning the goods. This period begins at the earliest on the day after payment has been received along with a copy of these instructions in written form. The prompt return of said merchandise or order satisfies a preservation of the revocation period.
Cancellations can be send to:
DMD Med Tech s.r.l.
Via Monviso, 14
10090 Villarbasse (TO) , Italy
Cancellation Consequences:
In the event of an effective cancellation the mutually provided goods and services shall be returned and, if applicable, any benefits enjoyed (e. g. interest) surrendered. In case the customer cannot return the received goods and services in total or in part or only in deteriorated condition, the customer has to, if applicable, provide compensation insofar. This does not apply for the delivery of goods, if the deterioration of the goods were due exclusively to their inspection – as would have been possible for you in a retail shop for example. Incidentally the customer can avoid the obligation for compensation by not using the goods, as if they were his/hers property, and by refraining from doing anything, that could impair their value. Items that are capable of being shipped are to be returned. The customer is responsible for the cost of said return. Goods that can be dispatched as parcels have to be returned at customer risk and expense. Obligations for refunding of payments will be fulfilled within 30 days after dispatch of the customer’s declaration of cancellation and the return of said merchandise.
What is the Purchasing Procedure?
Posted by:Send an order (by email or fax or web), in accordance with the distribution/reseller agreement, please indicating:
- your PO number
- products codes (see ‘Item list’ on product page)
- amount
- your courier code (es: TNT 12345678) or ask for our shipping service
- delivery address
Within 3 days maximum, (usually you will be answered in 1 day), you will be sent a P-invoice, with the ETD (Estimated Delivery Date) as a PO confirmation.
The customers with “T/T in advance” payment terms, should send the wire transfer receipt no later than the ETD.
The goods will be picked up within the ETD; if you prefer our DMD Med Tech courier, you will be provided of the AWB code (tracking number) immediatly after courier pickup.
How to reduce shipping cost?
Posted by:Products delivery is EXW, in accordance with the distribution/reseller agreement.
DMD Med Tech designed an ad hoc pallet, with the right dimensions to minimize shipping costs (depending on the whole expedition volume). We suggest you to buy parcel of VistaVisions of 3, 6, or 12 units, to obtain maximum efficiency.
Further, DMD MedTech stipulated an agreement with TNT to get very low shipping costs, probably lower than you could get (as we make high amount of expeditions each month). So a way to save your money is to order the goods with shipping included. Contact “Sales” to know shipping cost and shipping time.

