EX-(a)(1)(D)

$6.50 Net Per Share in Cash plus one non-transferable contractual contingent value right for each Share, which represents the right to receive up to two contingent payments, if any, of up to $1.00 in cash in the aggregate, upon the achievement of certain milestones

THE OFFER AND WITHDRAWAL RIGHTS WILL EXPIRE AT 11:59 P.M., NEW YORK CITY TIME, ON WEDNESDAY, OCTOBER 14, 2015, UNLESS THE OFFER IS EXTENDED OR EARLIER TERMINATED BY THE PURCHASER (SUCH DATE AND TIME, AS IT MAY BE EXTENDED, THE “EXPIRATION TIME”).

We have been engaged by Blue Subsidiary Corp., a Delaware corporation (the “Purchaser”), to act as Information Agent in connection with the Purchaser’s offer to purchase all outstanding shares of common stock, $0.001 par value per share (“Shares”), of Synergetics USA, Inc., a Delaware corporation (“Synergetics”), at a price of $6.50 per Share, net to the seller in cash (less any applicable withholding taxes and without interest), plus one non-transferable contractual contingent value right per Share, which represents the right to receive up to two contingent payments, if any, of up to $1.00 in the aggregate net to the holder in cash (less any applicable withholding taxes and without interest) upon the achievement of certain specified milestones within an agreed upon time period, at the times and upon the terms and subject to the conditions set forth in the Offer to Purchase, dated September 16, 2015 (together with any amendments or supplements thereto, the “Offer to Purchase”), and in the accompanying Letter of Transmittal (together with any amendments or supplements thereto, the “Letter of Transmittal” and, together with the Offer to Purchase, the “Offer”) enclosed herewith. The Purchaser is a wholly owned subsidiary of Valeant Pharmaceuticals International, a Delaware corporation (“VPI”), which is a wholly owned subsidiary of Valeant Pharmaceuticals International, Inc., a Canadian corporation (“Valeant”).

Please furnish copies of the enclosed materials to those of your clients for whom you hold Shares registered in your name or in the name of your nominee.

The Offer is not subject to any financing condition but is conditioned upon a number of other conditions as set forth in the Offer to Purchase. See Section 13 of the Offer to Purchase.

2. Letter of Transmittal for your use in accepting the Offer and tendering Shares and for the consideration of your clients;

3. Internal Revenue Service Form W-9 (Request for Taxpayer Identification Number and Certification), including instructions for completing the form;

4. Notice of Guaranteed Delivery to be used to accept the Offer if certificates for the Shares and all other required documents cannot be delivered to American Stock Transfer & Trust Company, LLC (the “Depositary”) by the Expiration Time or if the procedure for book-entry transfer cannot be completed by the Expiration Time;

5. A letter to stockholders of Synergetics from the President and Chief Executive Officer of Synergetics, accompanied by Synergetics’ Solicitation/Recommendation Statement on Schedule 14D-9;

6. A printed letter that may be sent to your clients for whose accounts you hold Shares in your name or in the name of your nominee, with space provided for obtaining such clients’ instructions with regard to the Offer; and

YOUR PROMPT ACTION IS REQUESTED. WE URGE YOU TO CONTACT YOUR CLIENTS AS PROMPTLY AS POSSIBLE. THE OFFER AND WITHDRAWAL RIGHTS WILL EXPIRE AT 11:59 P.M., NEW YORK CITY TIME, ON WEDNESDAY, OCTOBER 14, 2015, UNLESS THE OFFER IS EXTENDED OR EARLIER TERMINATED BY THE PURCHASER.

The Offer is being made in connection with the Agreement and Plan of Merger, dated as of September 1, 2015 (together with any amendments or supplements thereto, the “Merger Agreement”), among VPI, the Purchaser and Synergetics, pursuant to which, after the completion of the Offer and the satisfaction or waiver of certain conditions, the Purchaser will be merged with and into Synergetics, and Synergetics will be the surviving corporation and a wholly owned subsidiary of VPI (the “Merger”). At the effective time of the Merger, each Share issued and then outstanding (other than (i) any Shares held in the treasury of Synergetics and each Share owned by the Purchaser, VPI or any direct or indirect wholly owned subsidiary of VPI or by Synergetics immediately prior to the Merger effective time, which will be canceled without any conversion thereof and no payment or distribution will be made with respect thereto, and (ii) any Shares owned by Synergetics’ stockholders who perfect their appraisal rights under Section 262 of the General Corporation Law of the State of Delaware (the “DGCL”)) will be canceled and converted automatically into the right to receive the Offer Price.

The Synergetics board of directors has, subject to the terms and upon the conditions set forth in the Merger Agreement: (i) approved and declared the advisability of the Merger Agreement, the Tender Agreements (as defined in the Offer to Purchase), the Contingent Value Rights Agreement (as defined in the Offer to Purchase), the Offer, the Merger and the other transactions contemplated by the Merger Agreement (the Offer, the Merger and the other transactions contemplated by the Merger Agreement and the Contingent Value Rights Agreement, collectively, the “Transactions”), (ii) declared that it is in the best interests of Synergetics and its stockholders (other than VPI and the Purchaser) that Synergetics enter into the Merger Agreement and consummate the Transactions and that its stockholders tender their Shares pursuant to the Offer, in each case on the terms and subject to the conditions in the Merger Agreement, (iii) declared that the terms of the Offer and the Merger are fair to Synergetics and its stockholders (other than VPI and the Purchaser) and (iv) resolved to recommend that the holders of Shares accept the Offer and tender their Shares pursuant to the Offer. All directors and named executive officers of Synergetics have entered into agreements to tender their shares in the Offer.

Upon the terms and subject to the conditions of the Offer (including, if the Offer is extended or amended, the terms and conditions of any such extension or amendment), the Purchaser will be deemed to have accepted for payment, and will pay for, all Shares validly tendered in the Offer, and not properly withdrawn, prior to the Expiration Time if and when the Purchaser gives oral or written notice to the Depositary of the Purchaser’s acceptance of the tender of such Shares for payment pursuant to the Offer. Payment for Shares accepted for

payment pursuant to the Offer will be made only after timely receipt by the Depositary of (a) certificates for such Shares or a Book-Entry Confirmation (as defined in the Offer to Purchase) with respect to such Shares pursuant to the procedures set forth in the Offer to Purchase, (b) a Letter of Transmittal (or facsimile thereof) properly completed and duly executed, with any required signature guarantees (or, in the case of a book-entry transfer, an Agent’s Message (as defined in the Offer to Purchase) in lieu of the Letter of Transmittal) and (c) any other documents required by the Letter of Transmittal or any other customary documents required by the Depositary. Accordingly, tendering stockholders may be paid at different times depending upon when certificates for Shares or Book-Entry Confirmation with respect to Shares are actually received by the Depositary. Under no circumstances will interest be paid on the Offer Price for Shares, regardless of any extension of the Offer or any delay in payment for Shares.

The Purchaser will not pay any fees or commissions to any broker or dealer or other person (other than the Information Agent and the Depositary as described in the Offer to Purchase) in connection with the solicitation of tenders of Shares pursuant to the Offer. You will be reimbursed upon request for customary mailing and handling expenses incurred by you in forwarding the enclosed offering materials to your clients. The Purchaser will pay all stock transfer taxes applicable to its purchase of Shares pursuant to the Offer, subject to Instruction 6 of the Letter of Transmittal.

If holders of Shares wish to tender their Shares, but it is impracticable for them to deliver their certificates representing tendered Shares or other required documents or to complete the procedures for delivery by book-entry transfer prior to the Expiration Time, a tender may be effected by following the guaranteed delivery procedures specified in the Offer to Purchase and the Letter of Transmittal.

Questions and requests for assistance or for additional copies of the enclosed materials may be directed to us at the address and telephone number set forth below and in the Offer to Purchase. Additional copies of the enclosed materials will be furnished at the Purchaser’s expense.

NOTHING CONTAINED HEREIN OR IN THE ENCLOSED DOCUMENTS SHALL RENDER YOU OR ANY PERSON THE AGENT OF VALEANT, VPI, THE PURCHASER, SYNERGETICS, THE INFORMATION AGENT, THE DEPOSITARY OR ANY OF THEIR AFFILIATES, OR AUTHORIZE YOU OR ANY OTHER PERSON TO USE ANY DOCUMENT OR MAKE ANY REPRESENTATION ON BEHALF OF ANY OF THEM WITH RESPECT TO THE OFFER NOT CONTAINED IN THE OFFER TO PURCHASE OR THE LETTER OF TRANSMITTAL.