Interval Intraocular Pressure in Intravitreal Injection Study

Study design: A prospective study Sample size: 60 patients (180 readings) Recruitment: Patients will be recruited at the intravitreal injection clinic in Grantham Hospital. Randomization: Group 1: control (hypromellose), then Timolol, then Travatan Group 2: Timolol, then Travatan, Hypromellose Group 3: Travatan, then Hypromellose, Timolol There are three groups of different treatments. Patients recruited will undergone all three groups of treatments. During the first injection visit, patients will be randomized (by envelope method upon recruitment) to start with one of the three groups by envelope method. Treatment given to each group according to randomization in the first visit, then rotated to second and third group at two subsequent injections accordingly. Injection doctors masked to treatments given. Study visits: 1. Injection visit * Record the anti-VFGF injection to be given * Macula disease involved * Record no. of previous injections * Prophylactic eye drops will be given according to treatment group 1 hour prior injection * IOP immediately before injection (without speculum while sitting on table) * IOP immediately after injection (without speculum while sitting on table) * IOP 30 minutes after injection via iCare * Slitlamp examination, document inflammation or complications if any 2. Day 1 follow-up visit * IOP via iCare (sitting) * Slitlamp examination, document inflammation or complications if any 3. Week 1 follow-up visit * IOP via iCare (sitting) * Slitlamp examination, document inflammation or complications if any Visit a, b and c will be repeated for 2nd and 3rd injections.