+90 Lens Examination

The +90 lens examination is indicated when assessing individuals who experience difficulty seeing objects at close distances, such as reading or performing near tasks. It is particularly relevant for individuals over the age of 40 who may experience presbyopia, a common age-related condition characterized by the loss of near focusing ability.

Conducting the Examination

The examination typically involves the following steps:

Visual Acuity Testing: Assessing near visual acuity using standardized near vision charts or cards.
Retinoscopy: Objective measurement of refractive error using a retinoscope to determine the initial prescription.

Subjective Refraction: Fine-tuning the prescription by asking the patient to provide feedback on lens choices while looking at near objects.

Interpretation and Prescription

Based on the results of the examination, the optometrist or ophthalmologist determines the appropriate add power, which represents the additional magnifying power needed for clear near vision. This information is then used to prescribe reading glasses or bifocal lenses tailored to the individual’s visual needs.

Clinical Significance

The +90-lens examination is essential for addressing near vision difficulties associated with presbyopia, allowing individuals to maintain functional vision for near tasks and activities of daily living.