Subjective eye refraction

Subjective Refraction is an attempt to determine, by trial and error using the patient’s cooperation, the combination of lenses that will provide the best corrected visual acuity (BCVA). It is a clinical examination used by optometrists to determine a patient's need for refractive correction, in the form of glasses or contact lenses.

REQUIREMENTS
To carry out subjective refraction successfully, the following have to be put into consideration •The patient is seated at a 6-metre distance from the Snellen Chart or at an appropriate distance depending on the consulting room setting. •The illumination in the testing room is at a comfortable level of brightness for an indoor setting.
•Ensure the patient is relaxed and all sources of distraction removed. •For children, presence of a parent or caregiver will be an added advantage •Where language may be a barrier, it is advisable to have an interpreter present

ADVANTAGES
•Based on the patient's preference
•It is not an invasive procedure
•It is time effective
•High reliability
DISADVANTAGES
•Relies solely on patient's cooperation and ability to provide accurate responses •Can be difficult when there are language barriers and communication issues such as mentally challenged individuals
•Age (more difficult with children)