LIMITED POWER OF ATTORNEY FOR SECTION 16 REPORTING OBLIGATIONS

Know all by these present, that the undersigned hereby makes,
constitutes and appoints each of Mark Iwicki, Charles McDermott
and Mary Reumuth, signing singly and each acting individually, as
the undersigned's true and lawful attorney-in-fact with full
power and authority as hereinafter described to:

(1)   execute for and on behalf of the undersigned, in the
undersigned's capacity as a  stockholder of Kala Pharmaceuticals,
Inc. (the "Company"), Forms 3, 4, and 5 (including any amendments
thereto) in accordance with Section 16(a) of the Securities
Exchange Act of 1934 and the rules thereunder (the "Exchange
Act"); and

(2)   do and perform any and all acts for and on behalf of the
undersigned which may be necessary or desirable to prepare,
complete and execute any such Form 3, 4, or 5, prepare, complete
and execute any amendment or amendments thereto, and timely
deliver and file such form with the United States Securities and
Exchange Commission (the "SEC") and any stock exchange or similar
authority, including without limitation the filing of a Form ID
or any other application materials to enable the undersigned to
gain or maintain access to the Electronic Data Gathering,
Analysis and Retrieval system of the SEC.

The undersigned hereby grants to each such attorney-in-fact full
power and authority to do and perform any and every act and thing
whatsoever requisite, necessary, or proper to be done in the
exercise of any of the rights and powers herein granted, as fully
to all intents and purposes as the undersigned might or could do
if personally present, with full power of substitution or
revocation, hereby ratifying and confirming all that such
attorney-in-fact, or such attorney-in-fact's substitute or
substitutes, shall lawfully do or cause to be done by virtue of
this power of attorney and the rights and powers herein granted.
The undersigned acknowledges that the foregoing
attorneys-in-fact, in serving in such capacity at the request of
the undersigned, are not assuming nor relieving, nor is the
Company assuming nor relieving, any of the undersigned's
responsibilities to comply with Section 16 of the Exchange Act.
The undersigned acknowledges that neither the Company nor the
foregoing attorneys-in-fact assume (i) any liability for the
undersigned's responsibility to comply with the requirement of
the Exchange Act, (ii) any liability of the undersigned for any
failure to comply with such requirements, or (iii) any obligation
or liability of the undersigned for profit disgorgement under
Section 16(b) of the Exchange Act.

This Power of Attorney shall remain in full force and effect
until the earliest of (i) the date on which the undersigned is no
longer required to file Forms 3, 4, and 5 with respect to the
undersigned's holdings of and transactions in securities issued
by the Company,  (ii) August 31, 2017 and (iii) revocation of
this Power of Attorney  by the undersigned in a signed writing
delivered to the foregoing attorneys-in-fact.

IN WITNESS WHEREOF, the undersigned has caused this Power of
Attorney to be executed as of this 19th day of July, 2017.

  /s/ Justin Hanes
Signature
___________________
Justin Hanes
Print Name