A system for performing measurements of an eye, comprising: a measurement tool for performing measurements of the eye, the measurement tool including an objective and implementing an image capturing function using the objective, the objective being both a scanning camera objective used for pupil detection and a focusing objective for performing measurements of the eye; at least one rest (110b, 110c) designed to maintain a facial measurement position, the at least one rest (110b, 110c) defining a centering rest portion designed to maintain a lateral facial measurement position; an adjuster mechanism adapted to move the objective relative to the eye; and a processing unit configured to control the system to: position, via the adjuster mechanism and for a first eye, the objective at a predefined first pre-scan position, the pre-defined first pre-scan position being pre-defined by a maximum scan position or a minimum scan position, the maximum and minimum scan positions (300a, 300b) defining a vertical scan range for the objective; scan, via the adjuster mechanism, the objective away from the first pre-scan position, pre-defined by the maximum scan position or the minimum scan position, along a path parallel to, and laterally spaced from, a vertical center axis extending through the centering rest portion and towards the other of the maximum scan position and the minimum scan position until the system detects, via the pupil detection, a pupil of the first eye; and trigger one or more measurements of the first eye via the measurement tool dependent on the system detecting the pupil of the first eye. a measurement tool for performing measurements of the eye, the measurement tool including an objective and implementing an image capturing function using the objective, the objective being both a scanning camera objective used for pupil detection and a focusing objective for performing measurements of the eye; at least one rest (110b, 110c) designed to maintain a facial measurement position, the at least one rest (110b, 110c) defining a centering rest portion designed to maintain a lateral facial measurement position; an adjuster mechanism adapted to move the objective relative to the eye; and a processing unit configured to control the system to: position, via the adjuster mechanism and for a first eye, the objective at a predefined first pre-scan position, the pre-defined first pre-scan position being pre-defined by a maximum scan position or a minimum scan position, the maximum and minimum scan positions (300a, 300b) defining a vertical scan range for the objective; scan, via the adjuster mechanism, the objective away from the first pre-scan position, pre-defined by the maximum scan position or the minimum scan position, along a path parallel to, and laterally spaced from, a vertical center axis extending through the centering rest portion and towards the other of the maximum scan position and the minimum scan position until the system detects, via the pupil detection, a pupil of the first eye; and trigger one or more measurements of the first eye via the measurement tool dependent on the system detecting the pupil of the first eye. position, via the adjuster mechanism and for a first eye, the objective at a predefined first pre-scan position, the pre-defined first pre-scan position being pre-defined by a maximum scan position or a minimum scan position, the maximum and minimum scan positions (300a, 300b) defining a vertical scan range for the objective; scan, via the adjuster mechanism, the objective away from the first pre-scan position, pre-defined by the maximum scan position or the minimum scan position, along a path parallel to, and laterally spaced from, a vertical center axis extending through the centering rest portion and towards the other of the maximum scan position and the minimum scan position until the system detects, via the pupil detection, a pupil of the first eye; and trigger one or more measurements of the first eye via the measurement tool dependent on the system detecting the pupil of the first eye.