A patient with long-sightedness has laser surgery to steepen the cornea and can then read small print clearly. A different patient with red-green colour blindness uses a tinted filter; colours become easier to tell apart, but the condition remains.
Which statement explains the outcome for each patient?
Steepening the cornea increases refraction so light focuses on the retina; the filter focuses red light and green light onto different parts of the retina.
Steepening the cornea decreases refraction so light focuses on the retina; the filter changes how colours look, but the faulty cone cells still do not work.
Steepening the cornea increases refraction so light focuses on the retina; the filter changes how colours look, but the faulty cone cells still do not work.
Steepening the cornea decreases refraction so light focuses on the retina; the filter focuses red light and green light onto different parts of the retina.
135 exam-style questions on OCR GCSE Biology 3.1 Coordination and control – the nervous system, covering 3.1.1 Structure of the nervous system, 3.1.2 Coordinated response, 3.1.3 The reflex arc, 3.1.4 Structure of the eye, 3.1.5 Defects of the eye, 3.1.6 Structure and function of the brain, 3.1.7 Difficulties of investigating brain function, and 3.1.8 Limitations in treating nervous system damage. Each one has a worked solution and a mark scheme showing where the marks go.