Multiple clinical and technological studies demonstrate that objective methods—such as autorefractors, retinoscopy, wavefront aberrometry, and photoscreeners—exist and are widely used to measure degrees of nearsightedness and farsightedness.
The retrieved papers consistently discuss and evaluate various objective measurement tools (such as autorefractors, retinoscopy, aberrometry, and photoscreeners) used to quantify refractive errors like myopia and hyperopia. All relevant sources support the claim, with no evidence refuting the existence of objective methods for measuring these conditions.