The recovery period after trabeculectomy varies greatly between patients. The factors that affect the length of recovery include:
1. The eye pressure after the procedure. If the pressure is too low or too high the recovery may take longer (1 to 2 months)
2. The amount of corneal swelling. If the cornea swells significantly, it can also delay healing along with a long period of blurry vision
after the procedure. It may also take one to two months for full recovery.
3. Swelling in the retina (the back of the eye). This is painless yet makes the vision significantly blurry; sometimes for as long as three months.
4. The degree of visual loss already present from glaucoma
prior to surgery. In some cases, if the pressure is high post-operatively, there can be additional visual loss after the procedure. This process is slowed down once the pressure is stabilized.
The reason you must refrain from strenuous activities is because these tend to increase eye pressure and inflammation. Both of these factors can cause discomfort and affect your vision in the long term.
I know it is difficult to abide by the restrictions, but remember that relatively speaking, this is a short term sacrifice in exchange for a good long term result.
I hope this helps and good luck during this difficult time...