EXHIBIT 99.4

FORM OF LETTER

BROKER LETTER TO CLIENTS WHO ARE BENEFICIAL HOLDERS

SECOND SIGHT MEDICAL PRODUCTS, INC.

Subscription Rights to Purchase Units

Offered Pursuant to Subscription Rights Distributed to Stockholders of

 Second Sight Medical Products, Inc.

[•], 2017

To Our Clients:

This letter is being distributed to our clients who are holders of Second Sight Medical Products, Inc. (the “Company”) common stock, no par value per share (the “Common Stock”), as of 5:00 p.m. Eastern time, on January [  ], 2017 (the “Record Date”), in connection with a distribution in a rights offering (the “Rights Offering”) of non-transferable subscription rights (the “Subscription Rights”) to subscribe for and purchase units (“Units”).

Each Right allows the holder thereof to invest $0.47 toward the purchase of Units of the Company for each one share of Common Stock owned of the Record Date (the “Basic Subscription Right”) at the cash price of (i) $2.00 or (ii) the closing price of our Common Stock on its primary exchange on [           ] __, 2017, whichever is lower, per full Unit (the “Subscription Price”). The number of Units that you will obtain from your subscription will equal the result of the accepted dollar amount of your investment divided by the Subscription Price, rounded down to the nearest unit. For example, if you invest $470, and if on the Expiration Date the closing price of our common stock as reported by Nasdaq is $2.05 per share, the Subscription Price will be $2.00 (which constitutes lesser of $2.00 or closing price of shares on the Expiration Date), you would receive 235 Units consisting in the aggregate of 235 shares of our common stock and Warrants to purchase 235 additional shares of our common stock. By way of further illustration, if you invest $470, and on the Expiration Date the closing price of our common stock is $1.90 per share, the Subscription Price will be $1.90 and you would receive a rounded down 247 Units and a refund of $0.70.

The Subscription Rights may be exercised at any time during the subscription period, which commences on January [  ], 2017 and ends at 5:00 p.m. Eastern time on [                 ], 2017 (the “Expiration Date”).

The Subscription Rights are evidenced by non-transferable Subscription Rights certificates.

The Company will not issue fractional Units. Fractional Units resulting from the exercise of the Subscription Rights will be eliminated by rounding down to the nearest whole number of Units a holder would otherwise be entitled to purchase.

Enclosed are copies of the following documents:

THE MATERIALS ENCLOSED ARE BEING FORWARDED TO YOU AS THE BENEFICIAL OWNER OF COMMON STOCK HELD BY US IN YOUR ACCOUNT BUT NOT REGISTERED IN YOUR NAME. EXERCISES OF SUBSCRIPTION RIGHTS MAY BE MADE ONLY BY US AS THE RECORD OWNER AND PURSUANT TO YOUR INSTRUCTIONS.

Accordingly, we request instructions as to whether you wish us to elect to subscribe for any Units to which you are entitled pursuant to the terms and subject to the conditions set forth in the enclosed Prospectus Supplement and other materials. However, we urge you to read the Prospectus Supplement and other enclosed materials carefully before instructing us to exercise your Subscription Rights.

Your instructions to us should be forwarded as promptly as possible in order to permit us to exercise Subscription Rights on your behalf in accordance with the provisions of the Rights Offering. The Rights Offering will expire at 5:00 p.m. Eastern time on the Expiration Date. You are encouraged to forward your instructions to us before the Expiration Date to allow us ample time to act upon your instructions. A holder cannot revoke the exercise of Subscription Rights.

If you wish to have us, on your behalf, exercise the Subscription Rights for any Units to which you are entitled, please so instruct us by timely completing, executing, and returning to us the Beneficial Owner Election Form enclosed with this notice.

Additional copies of the enclosed materials may be obtained from Broadridge, Inc., the Information Agent. The Information Agent's telephone number is (855) 793-5068 (toll free). Any questions or requests for assistance concerning the rights offering should be directed to the Information Agent.