One aspect to eye drop adherence is successful instillation of the drops; however, it is well known that many patients struggle with this task. Difficulties may include aiming their drops,extending their neck, preventing excess drop leakage, avoiding contamination of the bottle tip and generating enough force to expel a drop from the bottle. Instillation aids are devices that aim to ameliorate one or more of these barriers.

Several eye drop dispensers had been developed in order to improved outcomes of eye drop instillation, including improved rates of successful administration and increased patient satisfaction compared to standard eye drop bottles.

In this study we aim to compare the eye drops various installation aids

subject will evaluate 2 dispensers by questioners. efficacy and safety of each one will be evaluated.

Inclusion Criteria:

• glaucoma patients

Exclusion Criteria:

• none