Question

Monovision problem solving example:

Spec Rx (OD -3.25 -0.50 x 180, OS -4.00DS, Add +2.00)
Patient CL Rx in Air Optix Aqua 8.6/14.2
OD -3.50 DS
OS -2.00 DS

What Rx would you prescribe for modified monovision?

a) OD: -3.25 -0.50 x 180, OS: Plano, Add +2.00
b) OD: -3.50, OS: -2.00, Add +2.00
c) OD: -3.25 -0.50 x 180, OS: -4.00DS, Add +2.00
d) OD: Plano, OS: -2.00, Add +2.00

Answer 1

The correct monovision prescription for the given patient cannot be determined without additional information about their visual needs. The person discussed in the LASIK problem was nearsighted, and the range of diopters needed after the procedure would be ±0.45 D.

Step-by-step explanation:

The subject involves the calculation of potential spectacle lens prescriptions and understanding of myopia and hyperopia in the context of refractive corrections through lenses or contact lenses.

Monovision Problem Solving

• In the case of the monovision problem presented, the patient's spectacle prescription (Spec Rx) for the right eye (OD) is -3.25 -0.50 x 180 and for the left eye (OS) -4.00DS with an Add of +2.00. With current contact lens prescriptions in Air Optix Aqua at 8.6/14.2 being OD -3.50 DS and OS -2.00 DS, the correct prescription for modified monovision would depend on whether we want to prioritize distance vision in one eye and near vision in the other or balance both visions in each eye. Option (b) OD: -3.50, OS: -2.00, Add +2.00 maintains the current contact lens prescription and provides balanced vision for both eyes. Without more information about the patient's visual requirements and comfort with monovision, it is difficult to definitively recommend one of these options over the others.

Laser Vision Correction and Diopter Calculations

• For the LASIK procedure problem, if the patient's eye power is reduced by 9.00 D with a ±5.0% uncertainty, the range of diopters needed after the procedure would be ±0.45 D. The person was nearsighted before the procedure, as indicated by myopia and the reduction in power of the eye.
• For the questions regarding the far point of a myopic person with a prescription of -4.00 D, their far point would be at the distance where the eye forms a clear image without corrective lenses. This can be found using the formula 1/p + 1/q = 1/f, where p is the object distance (far point), q is the image distance (on the retina), and f is the focal length of the lens. Similarly, calculating the power of the tear layer between the cornea and the lens for a nearsighted person involves accounting for the corrective effect of the tear layer in lens prescription calculations.