The best time for an eye examination and glasses fitting is typically in the morning. This is because after a full night's rest, the eye muscles, especially the ciliary muscles responsible for focusing, are thoroughly relaxed. This allows for more accurate results during the eye examination.

If the examination is conducted in the afternoon or evening, after a day of eye strain, such as prolonged computer use, the ciliary muscles may be fatigued. This can potentially lead to deviations in the eye examination results and subsequently affect the comfort and effectiveness of the glasses prescribed. Symptoms like dizziness and dry eyes may arise a few days after wearing glasses fitted in the late afternoon or evening.

It is important to have the fundus of the eye examined before glasses fitting. Visual impairment and difficulty in focusing may not solely be due to refractive errors but could indicate an underlying issue with the fundus. Individuals with such conditions should seek treatment at an ophthalmology clinic. By examining the fundus before glasses fitting, unexpected situations can be avoided, and individuals unsuitable for dilated eye examinations can be identified.

For individuals who already wear contact lenses, it is advisable to discontinue lens wear for 1-2 days prior to the eye examination and glasses fitting.

Eye examinations primarily assess the shape of the eyeball, and there are two main methods: instrument-based measurements and subjective assessments using trial lenses. The latter involves wearing a pair of glasses with interchangeable lenses to determine the appropriate prescription. This process ensures the correct fit of the glasses.

However, mechanical measurements do not account for individual subjective experiences and specific visual requirements. Therefore, it is crucial to wear the prescribed glasses for a period of time after computerized eye examinations and evaluate for any discomfort. If any issues arise, a re-examination is necessary.

Note: If an eye examination and glasses fitting are conducted in the afternoon or evening, it may be beneficial to request the professional optometrist to induce fogging in the eyes before the examination. This can help relax the fatigued ciliary muscles in the eyes.

In summary, while the morning is generally considered an optimal time for eye examinations and glasses fittings, the best time may vary depending on individual differences and specific circumstances. It is recommended to consult a professional optometrist or ophthalmologist to determine the ideal timing and glasses fitting plan based on individual needs.