Purpose: To assess the impact of 2 strategies for initiating therapy in ocular hypertension (OH) on drug use, intraocular pressure (IOP), and blindness caused by glaucoma. Methods: Using a simulation model, initiating therapy with timolol (strategy 1) and with latanoprost (strategy 2) was simulated for a hypothetic cohort of ocular hypertension patients with an initial IOP distribution (data of 1000 patients). Adjustment of therapy within 15 months and a subsequent lifelong follow-up, with an IOP dependent conversion to glaucoma, were modeled. The IOP lowering effect of medication (based on a meta-analysis) was applied by Monte Carlo simulation. Therapy could be maintained or changed, depending on the achieved IOP and side effects. Four drugs (latanoprost, timolol, brimonidine, dorzolamide) were used as monotherapy or in combination. Glaucoma conversion rate was based on literature. Results: Treatment goal was achieved in both strategies in 90% by monotherapy. This was 60% for patients with initial IOP's of 30mm Hg. The originally prescribed medication was maintained in 66% (1) and in 77% (2). IOP decreased with approximately 34%, from 25.4mm Hg (mean) to 16.7mm Hg (1) and to 16.5mm Hg (2) Blindness per person within 18.7 years of life expectancy was 0.0923 years (1) and 0.0870 years (2), which corresponds to approximately 1 month. The difference between strategies was 2 days spent in blindness per patient. Conclusions: The difference in clinical effects of the strategies is small. This is largely owing to the key concept of a target pressure, which underlies both strategies.
- ocular hypertension
- intraocular pressure