<prompt> Synchysis refers toCollapse of the vitreousBlack spots in front of the eyesLiquefaction of the vitreousDetachment of the vitreous  <response>: VITREOUS LIQUEFACTION SYNCHYSIS Vitreous liquefaction synchysis is the most common degenerative change in the vitreous. Causes of liquefaction: 1. Degenerations such as senile, myopic, and that associated with retinitis pigmentosa. 2. Post-inflammatory, paicularly following uveitis. 3. Trauma to the vitreous which may be mechanical blunt as well as perforating. 4. Thermal effects on vitreous following diathermy, photocoagulation and cryocoagulation. 5. Radiation effects may also cause liquefaction. Ref:- A K KHURANA; pg num:-244 