Rav Mordechai Steiner
In the Ohev Yisroel by the Apta Rav as well as in other holy seforim they teach us that Shabbos Chazon is in fact the highest and loftiest Shabbos of the whole entire year, greater than all the other Shabbosos!
Perhaps we can explain this based on what the holy seforim say regarding the Shabbos before Pesach which is named Shabbos haGadol - because Pesach is a time of great awakening down here below for the Jewish people when we left Egypt and escaped from the fiftieth gate of impurity and entered the fifty gates of kedusha and holiness. And since the Zohar teaches that all the blessings depend on Shabbos, worldly material berachah as well as supernal spiritual blessings, we find that Shabbos is the source for the bounty of all blessings and it itself is the source of the influx of blessings for Pesach and therefore we name that preceding Shabbos before Pesach as Shabbos haGadol which is the source of Pesach's blessings.
And so we can say regarding the Shabbos that precedes Tisha B'Av where the early sources teach us that when Moshiach arrives Tisha B'Av will be transformed into a holiday and will be a YomTov like Pesach, as it says in the Navi Michah 7:15 - "as in the days of the Exodus from the land of Egypt I shall show you wonders," and surely we will have then a great light as is explained in the Midrash that we will be able to see from one end of the world to the other, as the Navi says in Yeshaya 11:9 "and the entire land will be filled with the knowledge of Hashem," and since we anticipate the coming redemption in these days, especially on Tisha B'Av which is an auspicious time for being remembered and redeemed, as Chazal say in Midrash Eichah 1:27 that Moshiach was born on Tisha B'Av and that is why we call that Shabbos Chazon which means a prophetic vision - and the shefa and influx that vision has already been already fulfilled; since Moshiach shall arrive to enlighten us with the hidden light so that it will illuminate for us and we can see from one end of the world to the other, and on that Shabbos this vision has already been seen and sent and this is why it is named Shabbos Chazon, therefore it is a great and lofty Shabbos more so than all the other Shabbosos that year because it shines with the light of geulah and redemption.
Based on this we can explain the Zohar - they asked Rabbi Shimon where is the geulah hinted at in the Torah? Rabbi Shimon answered that wherever the greatest hester panim is, wherever Hashem seems most hidden that is where the geulah and redemption are hinted at.
Perhaps, suggests Rav Mordechai, that we can say that this also refers to Tisha B'Av which is the greatest day of hester Panim when Hashem seems most hidden for the entire year, it is such a dark day that are eyes are dimmed and darkened and we mourn the destruction of churban bais hamikdash, and specifically on this very day that appears to us so dark and dim, the light of the geulah is shining, as Chazal say that Moshiach himself is born on that day and further in Taanis 30b Chazal say that whoever mourns over the bais hamikdash destruction will merit to see its happy joyful rebuilding and rededication, and the commentators paid special attention to the fact that Chazal said that he will merit to see it - in the present tense which seems to indicate that we will see it immanently. So furthermore based on what we explained we can say that by mourning and paining ourselves over the destruction while anticipating for the coming redemption means that we merit immediately that on that day the geulah shines and now during these days when we pain ourselves waiting and anticipating for the coming redemption the time is auspicious as a segulah that we merit it, and then when the geulah arrives Tisha B'Av will be a great day that has been transformed from sadness and mourning into a day of happiness and rejoicing and so may we all merit that day when the Divine knowledge of Hashem fills the entire world with great light and Hashem should help and aid us all that we merit the right preparation before the coming of that great and awesome day, when the honor and glory of Heaven is revealed, in all its full splendor speedily in our days Amen.
