Which statement is NOT true when comparing BIO to Direct Ophthalmoscopy?

Which statement is NOT true when comparing BIO to Direct Ophthalmoscopy?

• A. BIO provides a larger field of view than Direct Ophthalmoscopy
• B. Direct Ophthalmoscopy has a larger depth of focus than BIO
• C. Direct Ophthalmoscopy has more magnification than BIO
• D. BIO provides a real, inverted image

Answer: (B)

Depth of focus tends to increase as magnification decreases. In indirect (BIO), the system uses lower magnification but a wide view of the retina, so you maintain focus over a larger range. In direct ophthalmoscopy, you get higher magnification, which narrows the range over which the image remains sharp. That means the depth of focus is smaller with direct ophthalmoscopy, not larger. So the statement claiming direct ophthalmoscopy has a larger depth of focus is not true. Think about the practical differences: BIO gives a much larger field of view while operating at lower magnification, and it forms a real, inverted image of the retina that you observe with the eye. Direct ophthalmoscopy provides higher magnification but a smaller field of view and a shallower depth of field.

Depth of focus tends to increase as magnification decreases. In indirect (BIO), the system uses lower magnification but a wide view of the retina, so you maintain focus over a larger range. In direct ophthalmoscopy, you get higher magnification, which narrows the range over which the image remains sharp. That means the depth of focus is smaller with direct ophthalmoscopy, not larger. So the statement claiming direct ophthalmoscopy has a larger depth of focus is not true.

Think about the practical differences: BIO gives a much larger field of view while operating at lower magnification, and it forms a real, inverted image of the retina that you observe with the eye. Direct ophthalmoscopy provides higher magnification but a smaller field of view and a shallower depth of field.